The Biden rule was aimed at preventing firings for political reasons (eg what’s happening in the FBI where they’re tracking down anyone who worked on Jan 6 cases in any capacity) - if DOGE wanted to shrink the overall size of the government, they should work with congress to defund specific departments rather than illegally impounding approved spending. Once that happens, the departments would follow the RIF ‘playbook’ to shrink the size of their teams.
And yes, they’re entirely common.. as one example the Air Force did a big one of its civilian staff during the Obama era. The military does them all the time for their base closures and realignments. Tens of thousands of staff were let go during that process.