“Stable” doesn’t necessarily refer to “reliable,” depending on the context. Stable is often used in reference to how often a distro releases new versions of the applications. Using Audacity as an example, in the current release of the distro, they’ll release security & bug fixes for version 2, but if you want version 3, you’ll have to wait until the next distro release.
Upgrades to a new version of an application can introduce new ways of using the app (i.e. icons in different places, how user-created files are written to disk, etc.), which is disruptive to enterprise op’s, which is why Debian & RHEL take this approach.
Hopefully that helps clarify things.
I’ve been using wayblue on my own desktop. They have sane defaults & very pleasant theme. They do a good job keeping their image up to date & enable auto-updating from the get-go.