No, m4 (mostly) is a specific architecture. There were things before it like m3. I'm not saying it's hard to understand what to do when new ones come out, but

No, m4 (mostly) is a specific architecture. There were things before it like m3. I'm not saying it's hard to understand what to do when new ones come out, but for each architecture there's a new machine family. GCE has only historically provided n1-whatever and you got whatever CPU platform we had in that specific building.