Totally valid. However to address this they added an option in 3.2.0 so that when updating, you don't get bleeding edge packages, but instead it's lagged by 1 month:
https://github.com/basecamp/omarchy/releases/tag/v3.2.0
So that's comforting.
Similarly, I use ProcessWire bleeding edge / dev branch, but if there have been changes in a particular week that I sense as more in-depth, especially those that touch selectors and database stuff, I usually wait another week or two to avoid potential subtle issues that are difficult to catch. I'd imagine I would use the same judgement with Omarchy.