Brew for native commandline apps, Distrobox for software that runs on other distros. Boxbuddy (GUI) is an easy tool to create and manage distroboxes, and the default terminal app, ptyxis, allows you to switch distros easily from the top-left dropdown.
And more options in the Bazzite docs https://docs.bazzite.gg/Installing_and_Managing_Software/
If a distribution didn’t come with any default software, it would be unusable out of the box by the average user. If you want that, choose something like Arch or Gentoo or LFS.
The point of FOSS is freedom and choice. You can choose a distribution that aligns with your needs, and once it’s running, you can e.g. replace Firefox with Chrome or use Nautilus instead of Thunar. Try uninstalling IE/Edge or Explorer on Windows for a direct comparison.