^Agreed. I've done it not in a fighting game, but I had Bomberman before returning over bugs and it worked fine, and I Am Setsuna had worked solidly with it, prefer using the d-pad button array for more precision playing Binding of Isaac as well.
The sticks are fine, but for something that requires a more 2D era approach, it's not ideal at all.
Also look now I never really noticed it, but I was more paying attention to not dying or something than being a FPS snit, but this here should be of value to anyone who was bothered by it:
https://www.engadget.com/2017/03/31/zelda-breath-of-the-wild-patch-improves-docked-switch-perform/
That so called 1.1.1 update to Zelda that said it made gaming experience more pleasant (like the vague turds they can be not saying HOW) well they fixed the frame rate on the game immensely. Runs far nicer/smoother than the WiiU release from the looks of things in docked mode and handheld (docked suffered specifically far worse.) That link has a youtube video where it runs the old release version vs the new for a stretch of time in the same walking path in a few locations. It's quite noticeable now that you can actually see the problem at hand.