You could if you choose so. However you would lose the GUI integration of it in the Settings and also in the the dropdown “control menu” on the taskbar.
Yes.
I can’t know for sure what it might have been.
If you want to try:
sudo systemctl stop power-profiles-daemon.service
sudo systemctl restart cpupower.service
check:
cpupower frequency-info
If you are happy with the outcome, you would need to mask the daemon because it is a depenency of gnome-control-center and would restart at boot:
sudo systemctl mask power-profiles-daemon.service
If I remember correctly, you might get some warnings of a sort in your journals about the daemon not found or not being able to start or some such. You could ignore those.
If you want to revert the whole thing:
sudo systemctl unmask power-profiles-daemon.service
And then stop-disable the other one.