I can’t speak for everyone, but one of the reasons I use Arch is precisely because Debian doesn’t have as many resources/assets as Arch.

AUR may not be perfect but there is very little software out there that someone hasn’t already packaged in it and it’s a great deal more convenient to use than faffing with custom repos.

The Arch Wiki is second to none too. I’ve even occasionally found myself using it when debugging other Linuxes.

I definitely wouldn’t use Arch on a server though. I mean, I have done, multiple times in fact, but they’ve always been personal systems. I much prefer FreeBSD for servers. Professionally it has usually been Debian, CentOS, or, much more recently, Ubuntu Server (but I really don’t like Ubuntu Server. Or Desktop for that matter).

Disclaimer: this is all my own opinion and I’m not trying to pass any of it off as fact.