Fedora and Debian have similar philosophies. FOSS only, packages must be built from source, no vendored dependencies. So they have similar policies regarding security and Fedora Flatpaks align closer to that than Flathub.
I believe Debian also doesn’t ship patented codecs in their main repo.
The only issue I’ve had with LocalSend is that it’s a bit buggy on iOS. If you leave the app open in the background and go back to it, it won’t be able to receive files. I have to force quit it and open it again to fix it.