I’ve been running unstable for a couple decades now as my desktop. I’ve occasionally taken months-long forays into other distros, but always come back to Debian. It just works, which is what I care about.

I’ve been running Debian stable on a ThinkPad as my everyday machine for over a decade. It just works. No issues.

It’s great. Not much else to say. You install it, it works, it doesn’t stop working unless you break it.

I have many times. apt install whatever desktop environment you want is usually a one-liner, and they are the un-modified stock versions, not themed to whatever fancies the distro maintainer. It has been my low-effort distro for a lot of years for any purpose. Packages are on the stale-side, so you might want to use different package container types for your preferred applications nowadays.

It works well, so long as you don’t mind your DE being a bit behind the latest version. With how much Plasma and Gnome have been improving in the past couple of years, that may matter a lot.

To be honest, I think it makes more sense than it used to. You can have an extremely stable base, and if you want regularly updated user apps you can utilise Flatpaks.

It works great with Plasma desktop