You can use dnf on OpenSuse, and it actually uses the correct /etc/dnf.repos.d
!
zyppers UI is horrible, no idea at what internet speed those animations make sense, not on an even 2,4GHz wifi.
I used QGis as a Fedora Distrobox didnt install the language package, because it installs only the one from the OS. on Tumbleweed all languages were always installed, but it had some issue where no plugins worked or something.
Same with RStudio, which works creat with iucar/cran COPR and the R-CoprManager app that makes it use dnf underneath.
Rstudio should absolutely install them as libs though, into /var/lib. Then the Flatpak could be made working too I guess.