While I don’t think it’s as high as 90% of users, I admit I didn’t think about people who would subject themselves to Arch just to not take advantage of what Arch has to offer.
(But seriously, why would anyone choose to do this when they can just install Mint)
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.