Some interesting insight
I'll start with the Shield and the Winterhawks Defensive Insights since you asked. While both can be a pain, neither one of them are remotely close to game breaking or overpowered. Can you kill other models without attacking them? Sure, but the percentage to do so is not incredibly high.
since he is a game designer did he have any comments about how these 2 abilities make Shael Han a better reactive army than the supposed reactive army teknes? Will checks due to backlash and auto hits are worse than a select few attack rolls back which is all the reactive army has in its army
The first thing to consider is that the Aura's are only 6", if you are suffering that much from a pair of 6" aura's, then you're not focusing on your Motivation and you're losing a game of attrition playing Mosh Pit style kill 'em all games.
unless your motivation requires you to actually kill models in the mosh pit, everyone seems hung up on the motivations but they rarely break a player and you still need to kill something. A game of attrition should not be easily decided by only half the shael han army
the Shields Defensive Insight causes backlash when a model generates a Magic result, in most cases this is a 20-30% chance, Suppression lowers that. Also like my approach to Deepmen, I prefer to throw single dice instead of 2+ in an attempt to clear infantry under the Aura. Also if a Magic attack is generated the model suffers Backlash, which is a Will Attack, so a high willed model isn't going to have to worry as much here. Anything that has Strong Willed or grants it to other models will also lower the chances of suffering a wound.
So his response to it is a very select few models which have suppression or what amounts to luck? So essentially they knowingly designed an ability which punishes multiple attacks?
The Winterhawks Defensive Insight requires you get an Over for it to activate. Sure it has the potential to do some damage but that is only 10% in most cases, but understanding what 2" is when placing your models is important here. However a Will Check is required for this as well, so it's still a 50/50 chance with Legionnaires to cause said wound.
when said as 10% it does not look bad but when you realize it is actually 1/4 or even 1/3 results which actually have a chance to kill a legionnaire its far from unlikely when you are attempting to clear out infantry. As to 2" being a limitation I wonder how close he thinks that actually is, 2" mean you have to be outside of 2 bases from the exploding legion model to not get hit, this means if you are trying to clear them out you can only engage 1/3 models to avoid this back lash.
The Winterhawks Inspire is pretty solid, however it requires contact with a friendly model, which coupled with Healing Vapors is great, it does create a need to be extremely smart about your troop placements and his Training is only about lane and table control as it can only deal damage situationally.
How is that situationally? Placing the models where they gain all the benefits of their rules is not situationally it is just smart play.
A pair of Galvanic Defenders wreak havoc when supporting Union Workers facing off against Legionnaires. A C.A.G.E is a nightmare. Sorik laughs at them. A Lineman Controllers training turns this army on it's head.
How do defenders wreak havoc? They allow a reroll of a horrid will of workers when they trigger the shields ability? They do nothing to negate vapors or winterhawk explosions. Their 1 die magic attack is a joke. Cage and Sorik do decently, the former rather than the later, but was the designers intent to shaft any teknes player who only invested in a starter? For the lineman controller to be your leader you had to give up a slew of far better trainings, which means unless you are tailoring lists prior to a game means you are not going to take it.
As to the Zalaak that was not mentioned here that pathetic waste of points is magic bait where it tends to get zapped with its garbage chart well before it can close to the 3" (at least vs a smart player) or due to that garbage chart just takes 2 normal hits and dies to the magic even in place.
Ashmen are built for countering this type of thing, Fel Hammers don't care as Offensive Expertise allows them to re-roll attacks...and The Unmasked and Arkan Thesh look at this army and salivate. When you have a pair of Longhorns to dissipate the Legionnaire block formation, pretty much any other Infantry in the Nasier army becomes that much better at taking this force down. Pushing a Legionnaire out of contact and out of the Aura completely negates any and ALL bonuses it had. The Great Horn is Wreathed in Flame...just call him a Honeybadger here.
how are ashmen built to counter this thing? I guess they get to throw out the die with the most disadvantage but they lack the actual number of attacks to actually kill anything.
As to fel hammers you get to chance hurting yourself just to net that reroll and you are more likely to trigger the winterhawks explosion changing it into a 50/50 anytime you are looking at actually hitting a legionnaire. The same goes for Thesh so I do not know why he "salivates" as he risks (even more) all the allied models around him without directly making the legion easier to kill. I guess the unmasked has the precision to at least try and avoid the skulls and bump up into hits, which nets them no aditional chance to actual harm the legion.
Longhorns get to knock 1 model an activation and as I have pointed out there is only 1 model that is easily knocked out of formation and if I get to choose civis as my motivation (since motivations are what this game is about
) than there is no model which can be pushed out of formation.
Greathorn is nice in that he generates a lot of attacks at varying points in his activation but nothing a responding unit of legionaries can not drop in a single activations. I guess you get the benefit of breaking the full line formation which means if you have some pelegraths left to activate you can knock them around and break up the formation.
As to goritsi and hadross I agree they are on a better footing than the two above
In short anything that allows you to manipulate chart results/dice rolls, or interrupt formations will cause issues.
but those things are few and far between and rerolls on bad charts are not good enough to constitutes a solution.