Yeah, I am comfortable with most DE’s, I’m flexible but I prefer KDE+Wayland.
Dolphin is poorly threaded though. For example: If I drag a large file from a network share to the desktop I can not drag another one to the desktop until the first copy have completed. If I connect my VPN or just an away-from-home wifi, Dolphin freezes, probably because it can’t find the local SMB connections in the “Remotes” group.
I’m also watching COSMIC, it has a very well thought out architecture though I suspect the first version will be too simplistic in terms of features - for example vs Dolphin.