I get this line in journal output for Cooker or Rolling (or Lx 4.3) systems:
Jan 29 12:05:24 omv systemd-modules-load: Failed to find module 'options vmwgfx enable_fbdev=1'
My guess that is modules that are present for some hardware but your hardware does not need them so they are not loaded.
I think the debug lines you refer to in Grub2 are these?:
$ sudo update-grub2
Adding boot menu entry for EFI firmware configuration
Remove echo commands from "/boot/grub2/grub.cfg"
If so there is certainly no harm to users systems. Grub2 (or os-prober) debug lines are unfortunate and our grub2 scripts probably need a rewrite. Maybe that rewrite happens for 5.0. If they are from os-prober that might be an upstream bug as os-prober is maintained by Debian.
The pipewire lines I have not seen. My guess on that is that if sound works they are nothing to worry about if sound does not work there is a bug and there needs to be a bug report.
For any user with sound problems in Rolling or upcoming OMLx 4.3 please file a bug report since the pipewire software is relatively new to OpenMandriva. Also one may switch to the older
pulseaudio-server as a workaround. Run this in Konsole:
$ sudo dnf remove pipewire-pulse ; sudo dnf --refresh install pulseaudio-server
Note: I will make sure devs are aware of all of these comments. Getting answers may take some time. People are very busy trying to get OMLx 4.3 ready for release. At the moment Rolling and Lx 4.3 are identical so these comments do relate to that effort.