That seems like all it is, though? I have moved some stuff off of Heroku to Fly, and the new features/capabilities you get are pretty cool. It's hard to be excited about moving anything to Render, which is just the same thing as Heroku.
Private networking, service discovery, built in static sites with a CDN, persistent disks, HTTP/3, cron jobs, health checks and more -- hardly 'just same thing as Heroku'.