The problem is that containers are opaque and authors simply don't care about quality. If say, fedora would allow containers by having deviating Versions of rpm

The problem is that containers are opaque and authors simply don't care about quality. If say, fedora would allow containers by having deviating Versions of rpms per app, it would be quite cool. The OS could inform me about apps using deprecated Versions, dependencies could be shared, etc. But people don't want to put up much effort when shipping their app. They want to build on some version of Ubuntu, add some manual hacks and expect everyone to use that container for the next decade or so. No one cares about dependencies, security or other nonfunctional aspects, sadly.