I'm wondering what's the benefit of .fuse_hiddenxxxxxx files?

I've ton of them and I periodically remove them manually which really painful procedure!

PS
I didn't face same issue when I used Nemo under Cinnamon desktop.

In which directory are you seeing these files? To my knowledge, KDE does not interact in any special way with FUSE (unlike GNOME, which directly integrates with it) so i'd be concerned if KDE was involved in creating these files.