I'm using Manjaro because SuSE Tubleweed didn't want to install that day. People like to hate on Manjaro but I honestly don't know why - the defaults are fine and I very rarely have issues despite using software from the AUR
It has been 442d 15h 07m 53s since Manjaro !$%&?*# up.
So a year and a half? That's not all that bad really. And that time it was a (admittedly bloody stupid) cock up involving the SSL certificate of their website not of the distro itself
Also I've just actually looked at EndeavourOS' website and it says very clearly front and centre that it's focused on the terminal, which is entirely not what OP was even asking for. It might be a fine distro, I don't know, I've never used it or checked how many years it is since they cocked up, but it doesn't present itself as a KDE focused distro which is what OP (and I) want!
Why? Because after a series of negligent incidents spanning multiple years, a couple of which impacted the AUR for everyone they've gone a year and a bit without another major incident?
Again, EndeavourOS exists -- all Manjaro does for you is hold back packages making things unstable.
I'm using it as a linux distro, which I then use to do things on my computer that I actually want to do like work and play games and browse the internet! I used the installer once and I seem to recall it was fine (though I'm not keen on the tepid green they chose as a colour scheme).