I will sound really nit-picky buy the biggest thing keeping me away from using KDE is that accent-colored bar on each window in the taskbar, and the different coloring of open/focused/minimized windows. I want it sleek but not cluttery.
I’ve tried about a dozen themes but I couldn’t find any that got rid of that and looked good. I tried fixing it myself but editing svg files was too difficult for me.
I hope plasma 6 adds more options for this but I’m not holding my breath.