Arch is rolling release and you take the good with the bad. The ones who try to defend arch as some paragon of stability miss the point that Arch's model is inherently unstable, but it comes with other benefits.
I'm the one who kicked off this entire conversation pointing out that arch is unstable, and it cracks me up watching silly people scramble to try and defend Arch as being some paragon of stability.
No, it's not. That's baked into its identity.
I also agree that you shouldn't run your production database on Arch Linux. It isn't made for workloads like that. But personally I find maintaining Arch Linux+"custom packages"(with AUR) easier then Debian+"latest packages"+"custom packages".
Back here in reality, rolling release is less stable because more bugs in the software get through. And this is a reasonable expectation and not some magical fairyland where bugs never get written so being right up against the dev branch is as stable as being on the stable branch.
We really live in two different software worlds. Every software I'm using has its number of bugs a purely decreasing function of time, especially in the "main" paths and use cases.
If it were true, it means there wouldn't be bugs in the first place because they wouldn't have gotten written. The very fact that the bugs got written implies new bugs can, and will, be introduced.