See: Difference between Apps and Machines - #4 by ignoramous
Pretty much, yes. Search around the forum for issues with multi-process v1 apps, autoscale apps, scaling in general and you’d see why…
Expected: Preview: Postgres on Machines ( Fly Apps V2 )
Everything will be v2, and v1 apps (presumably) would be migrated over to v2 as well… Fly Apps on machine prerelease