Inside of steam, you can click on a game to browse local files. It works on Linux anyway, just opens my file browser to the right place.

I agree it should be rare, though I have had to do it for stuff that I wouldn't consider to be too advanced (using mods) but it's fair to say that it's still uncommon in the grand scheme of things since most games have a decent UI for handling mods already.

I maybe need to get to a game folder... three times a year? The only time it was more than that was when a modder I really liked stopped publishing releases outside of github so you had to copy them to the right place manually.

I don't have a filebrowser. For me it'd be enough if they had the number visible and hopefully allow me to highlight it too