> If I write a GTK app and want to make it available for Ubuntu/Debian users through official repositories, I need to make sure it gets added to the official package list, and every time I make a new release, someone else somewhere else has to do additional work just to repackage the application so it is available in the repository.

Yes, and that's a good thing for a whole bunch of reasons.

If you don't want to leave it up to the distro maintainers, nothing's stopping you from standing up your own repo to distribute your software to a particular distro. It's a one-liner for users to add your repo to their list so they can use their package manager to install and update your software as usual.

> Essentially, something like Flatpak is a middle-ground solution

Yes, I get that it's convenient for maintainers. But it kinda sucks for users (at least for me), which is why I avoid using software packaged that way.

I'll give flatpack this much credit, though -- it's not a nightmare like snaps are.