I never have issues with File Explorer in Windows 11, if anything it's improved since (finally) landing tab support. I never see most of the issues I've seen some users report and it makes me wonder if they're using tweaked/hacked/modded/"debloated" Windows or apps like ExplorerPatcher. IMO this would be a waste of resources but I guess to each their own? *shrugs*
There's plenty of alternative file managers out there, with Total Commander, Directory Opus and XYplorer coming to mind. In fact I just tried that Files app from the Microsoft Store today and it has some of the worst performance issues, crashes and other bugs. It performs much, much worse than File Explorer does, that's for sure. So the market is crowded enough, again, IMO.