Ah yes, let's dropkick a good feat into unusable territory for the final patch, because after 2000 hours Underrail just isn't challenging anymore.
You already have to spend 6 stat points (the same amount that you obtain naturally through leveling to 24) and be within <30% HP (a death sentence in Dominating) for it to be active.
When you enter Depot A you can't use Survival Instincts by itself anymore, much less if you're a psi user. You'll simply die to the copious amounts of acid damage, even with full mutated dog leather armor and boots. And this keeps up throughout the game outside of edge cases that already have ways to cheese it without the need for a feat (ie. Arena); SI isn't the game breaking feat you think it to be that instantly makes everything die because you're simply nearly dead.
To be able to walk around with such low HP, you still need to invest into either tanking feats and equipment (Conditioning, Stoicism, Juggernaut, and metal armor) which are part of Constitution; or MP feats and equipment (Fancy Footwork, Hit and Run, Sprint, and tabis/strider boots) so you can abuse line of sight with Agility feats, even more stat points that don't even go towards your health but instead give you adaptability.
Let's look at even more overpowered feat combos (or even single feats) that don't need as much investment, shall we?
Flurry and Fancy Footwork. Psionic Mania and Premeditation. Grenadier and Three Pointer. Ambush. Concentrated Fire. Commando.
Hell, if you're so butthurt about people using feats that synergize together, why don't you suggest to nerf Fight Response too? It's already a Veteran feat that comes near the end of the game and doesn't nearly give as much AP as Contraction which can be obtained right out of Depot A. Let's nerf it even further, people are breaking the game using a Level 26 feat in conjunction with 3 other feats.
I'm not even going to address the changes suggested in this thread which require you to take damage that exceeds your max HP and mechanical damage resistance with metal armor in Dominating for an equal effect to what already exists.