I used XFCE for more than a decade and it's my first choice when picking a DE. Two major issues tempted me to try KDE this year: the lack of Wayland support and the absolute asinine file picker/ chooser dialogue XFCE took from gnome, if I remember correctly. Having a file picker that marks the text of the file name, but when you start typing switches to the search bar drives me nuts. (Even when you just want to drop a downloaded file somewhere in a directory ... why would I want to search in these circumstances??)

I'm keeping an eye on XFCE and they plan to release Wayland support some time this autumn. Once this is somewhere near stable, I thin I will switch back again to XFCE.