What version of OSX was Lion? Snow Leopard 10.6 was the last one for the original cheese graters, and I know plenty of people running those and Final Cut 7 systems. It ain't broke, so they ain't fixin'. It's older SD tape based work flows that just ingest content from tape all day long, and then places it on the SAN for others workflows.

Lion is 10.7, one after Snow Leopard.

I’m not sure why you’d run 10.7 instead of either 10.6 or 10.8 (or 10.9) btw. Lion is buggier than the adjacent releases (which are really solid).

Lion was the last version of OSX that I ran. After having my hard drive corrupted twice by it I gave up and put Debian on my macbook.

Lion is the Catalina of its era, right down to all the broken legacy apps (because no Rosetta). Catalina is much worse, mind you.

Mac Pro 1,1 was officially supported to Lion, it can run up to and including El Capitan if you use a patched installer .

The last cheese grater perfectly supports Big Sur, short of wireless drivers.