Because when all abilities are roughly around the same power level every ability is satisfying, rather than just a handful abilities or tactics which are disproportionally powerful. I could flip it around again and say "If every build can go through Tactician why care that it got nerfed?" but I think we both agree that this sort of argumentation is sort of purposeless and circular. I get why you don't want things to be nerfed, it's not fun when a tactic you've enjoyed becomes less effective because of mechanical interference; but I would advocate for appreciating it because overreliance on the tactic is barring you from enjoying all the other tactics.
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Singleplayer balancing means that no one strategy homogenises the game and cheapens it. You can choose not to use them, yeah, but wouldn't you rather that you never even had to make that choice because EVERY approach was rewarding?
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So to ME all I'm seeing is that what was the optimal strategy is removed and replaced with multiple equally viable strategies, which INCREASE freedom of choice.
I agree with this line of thinking.
