Use a distribution with a large package library that is kept up to date and there is noting to miss.
Ubuntu is starting to push Snaps. So, that is becoming an unavoidable reality for Ubuntu users. For the most part though, Flatpaks remain optional for most distros.
The problem that Flatpaks solve is that the distro provided packages are out-of-date. If they are not, there is no real reason to prefer Flatpak.