The majority of them were in the Injustice 2 era and before.. We’re talking 6-7 years ago at this point. I don’t think there’s any question that NRS’ balancing strategy in recent years has been on the conservative side.You aren't wrong, but what you're describing is players finding ways to overcome the changes in their characters, which though admirable, shouldn't even be necessary. Not because nobody should ever be nerfed ever, but rather because characters shouldn't ever be nerfed so hard that their tournament viability should be in question.
And even still, you are talking about just 1 character in 1 game. I listed damn-near a dozen of them in a half-dozen NRS titles that have all gotten hit with the NRS Nerf Bat. Some, like MK11 Johnny Cage, still were able to place high in tournaments due to nothing less than a Top-5 MK11 player in Xombat using his main character. But so many others, like MK11 Sheeva, MK11 Sonya, MK9 Sub-Zero, etc... saw virtually zero high tournament placements again.
Are we to believe that all the players of those characters didn't do enough post-nerf lab work? Or that they all didn't stick with their characters long enough? I would say not.
I would say that perhaps NRS nerfed those characters too drastically. I'm not sure why the possibility of that is seemingly so difficult for you to acknowledge.
Ironically enough, the lack of lab work against many of these characters' opponents online followed with hordes of complaints is what led to many of these nerfs to begin with.
And then - I didn't even mention this - there are non-top-tier characters that somehow wind up getting hit harder in some patches than the top tiers do! MK11 Kitana and Scorpion come to mind in most recent memory, but there are many others, some of whom I named before and some I didn't.
The point of what I'm saying is this: for every character that NRS has historically nerfed in a reasonable way, there are at least two others that have been killed. Therefore, we are more than justified in being paranoid when it comes to NRS's style of character adjustment. Yes, it's possible that NRS will nerf the top characters in a reasonable way - but considering their history, it's more possible that NRS will over-nerf at least one, if not more top character(s).
We have every right to be worried.
MK11 Sonya wasn't placing pre-nerf, so I think it's hard to say the nerf was responsible for a lack of tournament success.
Also, Kombat was pretty much the only JC putting in work at that level pre-nerf, so it’s not as if we went from tons of cages placing to just the one. The character absolutely needed to be toned down from the point where he was outzoning the zoners.
At EVO 2023 half the top 8 used him at some point (Rewind and both the Chilean bros) so I think it's clear the character was still very viable at that level.
In most cases the character’s viability shouldn’t be in question, but people have knee-jerk reactions to any nerf, and are too quick to declare characters dead. Then other people just start repeating what they’ve heard, and no one actually validates the assumptions.
Baraka is a perfect example. The character has been more successful post-nerf than before it, but 90% of people were happy to declare the character dead and move on. If it wasn’t for players like Tweedy and Tekken Master who were willing to ignore the prevailing opinion and keep labbing, people would still be saying the character sucks now. For a character to actually get nerfed "to the ground" is exceedingly rare in recent years.