The launcher is a fair point. Though for me at least, not having the spotlight-esque search hasn’t been a problem. Appearance is an odd one, since the best part of Both Gnome and KDE is the wonderful flexibility in visual customizability. At the end of the day, I suppose I’d happily use either. Right now, I think Plasma’s big features for me has to be window snapping and, once 6.0 releases, hopefully HDR support.
Also worth noting is their history as an IP mill. Dead By Daylight is a surprise hit amongst many a licensed deal to produce games that would nearly qualify as shovelware in most cases over the last 20+ years. DbD gives them some independence, but they’re still largely a “studio for hire” by anyone who needs them.