Amen. KDE4 was a disaster in the beginning. I toughed it out then. I was in academia and could spend some hours dealing with breakage.
When Ubuntu shipped KDE5, normal usability stuff broke horribly again. Nowadays I have two kids and a job managing a large IT organisation. I simply can't defend spending the time any more. So I switched to xfce for the time being. Of that breaks the UI in any comparable way, I give in to the hordes that keep ridiculing me for not using a Mac. :(