Guess we simply apply different meaning to the word "stable". (you do you, though, and if it's alright with your workflow, yay!)

To me, stable means reliably working without any special maintenance. Arch requires you to update once in a while (otherwise your next update might get borked), and when you update, you may have to resolve conflicts and do manual interventions.

Right now, I run OpenSUSE Slowroll (beta, not released yet) on one of my machines and EndeavourOS on the other. The former recently had to update 1460 elements, and one intervention was required - package manager asked me if I want to hold one package for a while to avoid potential dependency issues. Later, it was fixed, and otherwise it went without a hitch. This is the worst behavior I've seen on this distribution, and so to me it renders "acceptably unstable" for general use (although I wouldn't give that to my grandma).