it's KDE, it's users will never admit it but it's a buggy mess, but it looks so pretty which is what really matters.
i liked using KDE but not because it was "pretty" but because i love solving problems and KDE always provided plenty of those, nothing serious but many little things that add up that i could never explain or find answers to, for example:
spending hours customizing themes/looks of everything to my liking only to reboot and find it's like i was never there. not just a few settings, all of them! over and over as if i had been using a read-only live environment. (i wasnt btw).
this mysteriously stopped happening a few days after installing for the most part but still certain settings would randomly decide they didnt like where they were and so decide to try something else .
the wifi issues for some reason seem to be a lot more common for KDE users, for me i just had to wait 20-30 seconds for wifi to fail to connect and then it would retry again and connect as it should of the first time. this was not a big deal since it did work after all.
pulseaudio regardless of how the configuration files are setup would revert to defaults every time audio or video was paused, so every time i had to pause or the next track started playing i then had to open pulseaudio equalizer and cycle it off/on for the EQ to work. eventually after seeing red for days of frustrating BS i tripped over the solution which is more a workaround of restarting pulseaudio in user mode (as it should be anyway but is not)
systemctl --user restart pulseaudio. this has only happened to me with KDE.
KWIN and nvidia, well waking from suspend looked like my desktop on acid, nothing short of restarting KDE's session or rebooting fixed it, restarting kwin did nothing. waking from suspend was just something i did right before i rebooted (not by choice).
i could go on for days but, yeah it's pretty. (it was before i got rid of it anyway)