I started on Debian, Ubuntu and Fedora. Native apps where often horrible. I remember SciDavis for Ubuntu being completely broken, Libreoffice for Fedora, and Flatpak just worked.
Officially supported Flatpaks are great, a bit like the Windows way but better, as they are reviewed, containerized and in an actual repository.
But flatpakking random apps isnt that easy, but I really want to learn it. Especially an easy semi-automatic way of converting Appimages (may they burn in hell) to Flatpaks. Like BalenaEtcher and so many more.
Also, Flatpaks are not secure in the case of biig projects. Nearly all the known Linux apps like Libreoffice, Gimp, Inkscape etc are unisolated. And trying to specify the permissions (only home and all the mounts, instead of your entire root partition) gives you “they are insecure anyways and should get portals” and your PRs closed.
So they are in a very incomplete state currently, and you need to manually secure them to be actually kinda protected. But without Portals, entire home access is not actually isolated.
Problem here is that many apps like VLC, that work great, are not yet adopted by upstream, so the verified repo is not really usable currently.
And native messaging (keepassxc-browser, etc.) and other things are not always working. Drag&drop is, for some reason, but not in Firefox, maybe there are different ways.