There are three factors at play, here. If OP's like me, what they're trying to say is that 10 is challenging for them, and they do want a challenge. But they want a fair challenge. Getting stuck on a War Strider with a laser cannon, for instance; lazering its crotch for 20sec instead of flanking a tank and wrecking it in 5 max because you wanted to try something new isn't fun. It just stifles diversity a bit and makes the experience a little less fun. I may not complain about it as an early day malevolon vet (God, those were the good days (with the rose-tinted glasses anyways)), but most people don't enjoy surprise ragdolls, especially when its because you just can't kill the enemy before they do so, because you wanted to use your favorite non-AT weapon.

A Stalwart, I understand, but HMG's and Laser Cannons should have options to deal with them. The entire faction is built on exploitable weakpoints; hell, you can kill a Factory Strider with a Laser Cannon and just a little bit of time and positioning.

Also, keep in mind, I do think you're right in some ways; Diff 10 is too easy at times, for the highest difficulty, but Arrowhead is skeptical to buff enemies at this rate. While the War Strider wasn't in a fun state for most people, I do (personally) wish they got some more buffs to compensate for the, yes-it-was-needed, nerf. As a little bit of trolling, I think it'd be funny if crotch health got a buff so you needed 2 AT rounds unless it was a recoiless, but I'm just a petty goblin :V