I've been using Kde for about 3 years now and to be fair, do have some issues from time to time.

Most annoying has to be that when I try to launch discord for example, I type "discor" and press enter immediately. But it hasn't really registered the "r" yet so it launches discover instead. But I just learned to wait a bit after typing.

Kde also had some crashes, although very rarely. So nothing I really care about.