I also ran into problem with 10.000 files changing the quick switcher behaviour which prevents me opening specific files.
I have a file called “MOC MOC” (a map of content, mapping all the map of contents). When I now filter the quick switcher to “MOC MOC” (the literal file name), the file won’t show up:
So there is no way for me to open up the file “MOC MOC” via quick switcher even though searching for its full literal name.
I only ran into this on desktop, as I don’t sync most files (PDFs) to mobile - and on desktop I assume I would have enough ressources to power the fuzzy matching even with more files.