I think there's two big things involved: firstly, that distros just bump library versions of frameworks like Qt and regressions in the frameworks introduce regr

I think there's two big things involved: firstly, that distros just bump library versions of frameworks like Qt and regressions in the frameworks introduce regressions in the app, which is exactly the kind of conflict that causes annoyed users and upstream devs (and it'll especially annoy the devs if they're called 'irresponsible' for not keeping on top of the release treadmill for vague security concerns). Secondly, OBS has features which need various API keys to integrate with different services, which I think third-party builds can not easily include just by the rules of those services. That's a bit more of an annoying one to deal with, because it means even a packager doing a good job and actually testing the software still can't reach feature parity, but it's also not something OBS can really do that much about.