Fwiw, on my m3 + max ram, I also was recording 1080p 30-ish minute obs videos for a while running large Ableton Live project playback + a facecam, and (while I don’t remember specs specifics) I didn’t find it to be unstable. I don’t do heavy video editing, so I’m not sure about the requirements, but for obs in 1080, it felt fine for me. I think I also exported some edited 4k footage at one point though, and I seem to remember rendering that one took a solid amount of time, so if you think you might move to 4k, pro might be more appropriate.

But I remember having specs reservations when getting my air, and I have not regretted it at all. Especially when I see my friends lug around their monster of a laptop. Those pro machines are thicc

FYI graphene does still rely on the Google updates:

https://grapheneos.org/faq#device-lifetime