Dolphin is able to remember the user’s preferred view style for a folder. This is a nice thing, but the implementation involves littering folders with hidden .directory files. This is similar to how Mac OS X does it with .DS_Store folders. It is very irritating, especially when using flash drives or cloud storage. I’d also have to explicitly ignore it in git for example.
I would like to propose that there is an option to not use .directory files, and instead have dolphin look up the settings from a centralized database. This is more complex, but avoids having to litter them everywhere.
Windows used to do this sort of thing with thumbnails by making a file called thumbs.db, but has since gotten rid of it by doing the above, and I think it’s a good thing.