Unfortunately this means that sometimes the project maintainers get complaints and not the package maintainer. Two projects I’m involved with don’t officially support Flatpak. With one of them we do want to support it eventually but things just aren’t there are and we have far bigger fish to fry.
The problem is that some well meaning people have created flatpaks and published them to flathub which means every single time something breaks or doesn’t work correctly they come to the actual project to complain about something we didn’t even do.