Same here, although mine was with a fresh install. Only hiccup I had was from an outdated archinstall script with incorrect dependencies. Since the system has been up and running I’ve seen zero issues with plasma 6 itself.
Went from mint with cinnamon and x to arch with kde and wayland, and somehow it’s been a smoother experience…
Rolling releases for issues with newer hardware and the AUR. That’s really all there is to it. There are plenty of ways to be “unique”, but at the the of the day, nobody else is ever really going to care.
If I bought myself a 6 year old Thinkpad, I’d put Mint over Arch on it in a heartbeat. For the desktop that’s constantly upgrading, it gets Arch because it has the fastest releases and biggest community to troubleshoot stuff.