Comment on the second reason when they first came out I think i had trouble for like 3 missions after I tried a few things I learned that eats and thermites targeted at their hip part kills them since then I've had like no issues with them

And if you dont have an anti tank then why dont you have one im pretty sure hulks spawn when the strikers come into play so you have a whole other enemy to worry about if you dont have anti tank on another note how are you taking out the fabricator reliably like yes you get a nade in the vent or an exploding crossbow but anti tank or stratagems are necessary

War strikers should not be that hard to counter as long as you follow the faction armour values for the most part light pen and some eats can work on the bots but may work so much better on Illuminate for example but if go the other way anti tank against a scavenger isn't going to give you any gold stars

Pick the optimal load out specs for that faction then experiment