Author here: to be clear, I am using KDE back and forth since I bought a Steam Deck 3 years ago, and before that I used KDE daily during the 4.x days (so I am familiar with KDE bugs actually).

I am using it in my main machine now for almost 2 weeks, and this is the period of time that this blog post refers too.

I'll be clear I'm not trying to be antagonistic or speak out of line - I think it's a great DE and I use it daily. It's 90% there and everyone's experience will be different based on the large deployment scape.