Plus they always try to hide how stuff works behind the scenes so that day that upgrade script has a bug and fails, it’s hard to revert to a working stage.
Yunohost is creating backups for apps that are being updated. If update fails, it automatically reverts. Yes, it works, I checked.
those projects get eventually abandoned,
Yunohost is here for years now, and it does not look like it will be abondoned any time soon.