I’m wondering if a package manager like flatpak comes with any drawback or negatives. Since it just works on basically any distro. Why isn’t this just the default? It seems very convenient.
I don't use Flatpak much, but I rarely see issues. Sometimes I see minor things like themes not quite being right, but its never been bad enough for me to spend the time to fix it.
I suppose another downside is the need to have the base runtime packages, so it could take more disk space if each app uses a different one. In practice apps will share runtimes though.