It's just as bas on Windows. Operating Systems and Applications have been using the user's hard drive as a trash dumping ground for decades. Temporary files, logs, caches, caches of caches, settings files, metadata files (desktop.ini, .fseventsd, .Trashes, .Spotlight-V100, .DS_Store). Developers just dump their shit all over your disk as if it belongs to them. I really think apps should have to ask permission before they can write to files, outside of direct user-initiated command.