> Doesn't quadlet fix some or all of those problems?

It definitely can solve some of those problems, and that’s the approach I’d generally recommend.

But to answer OP’s question - my supposition was that the mere fact that such a device is even necessary (when compared to docker) is an added work that isn’t obviously easy to implement for someone who is just trying to learn how to containerize their app (and might be a developer but not that experienced with Linux administration) and this one of the main reasons Podman isn’t as popular as Docker.

I think Podman is better in a number of ways, but it isn’t the most intuitive to implement compared to Docker.