Anything wrong with using an SSD as a Time Machine drive? Just upgraded to a Mac Studio, added an 8TB external Samsung (has roughly 3K TBW endurance, pretty hefty). I'd really like to retire my existing Time Machine spinner.
Nothing wrong with it. I use an oldish Samsung T5 with TimeMachine. I also have a separate TimeMachine backup to a an Asustor NAS but if something happens I try restoring from the SSD first due to the speed.