Kde devs imho, spend quite some time on halfbaked ui stuff like, for example, a buggy floating panel, custom highlighting which not only breaks stuff but only works half and what not. I hope in some (utopic) future they'll add some more proper ui stuff like more modern application styles for example. I mean, Breeze is okay-ish I guess but things like fusion and long overdue oxygen....common man. It will never happen of course, but I'm just saying.
In the screenshot, Lightly application style, custom color ( cause that highlight **** can't do it), custom rounded plasma, custom rounded breeze icons.
They claim that a bunch of stuff is technically hard to achieve. Myeah....total boll...s if you ask me. It's weird that third party devs can do it and in some cases do a much better job at it for that matter.
https://imgur.com/a/23bYWQP