TL;DR: I finally got to sit down and watch Severance Season 2—thanks COVID! I’ve got a lot of thoughts about how the show has evolved since Season 1, especially around the Mark-Gemma storyline and what it means for the bigger picture at Lumon.
Season 1 vs. Season 2: The Shift From Mystery to...
This was a surprise: Severance is edited on a Mini amongst other machines like MacBook Pro. It's in the "Behind the Mac" video linked in this page. They must have some large external Thunderbolt disks or now use 10Gbps networked arrays,
https://www.apple.com/mac/lumon-terminal-pro/