The whole point of flatpak is so that the upstream maintainer can release one well tested binary and it works on all distros...

As a long time Linux user and someone who tried to get in some software into Few Linux Distro Repositories, it's high time we start recommending the above model.

Not my words, but at this point I'll even take just a zip file with apps that always just works over having to deal with all the headaches from distro package managers for user level software.