Well, it is. Is so stable that many of Arch users install Arch once and don't have to format the computer again in years.
Of course you can't say that Arch is as stable as Debian, cause it's not. But it's totally unfair compare these distros, cause the use cases are completely different.
I called it "stable enough". For a home user, it's stable enough. It's a myth that Arch will break every update or it is unstable. Arch is as unstable or stable as you make it be.
You also can't setup automatic updates safely
That's partially true. If you're trying to run a server, yeah, don't set any automatic update. If you're home user, you may do it and you'll be fine, but be aware of your system.
Arch is easy to maintain and is stable enough. Of course you can make Arch unstable if you do greedy stuff, but if you use like a normal person, it will be fine
It's using Arch for 5 years now and I never broke my system, for example
I don't know if I correctly understood but I think that KDE plasma has this functions you need from DisplayFusion. You need to use Virtual Desktops + Activities, both inhetit to KDE
Maybe I didnt undertand correctly, but I think this may do the job for you
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