Yeah, I like Dolphin also. It doesn’t actually need KDE to be running as window manager; probably does need KDE services but runs fine with other managers such as Xfce.
I’m pretty sure it needs KDE services, so if you’re not running KDE it would be a pretty heavy app to be running for the features (if you didn’t have any other KDE apps). Still, it’s definitely slick for moving files from one place to another. Wish my stupid work laptop (running Win10 -UGH) had a native ssh server running.