I do feel like better application sandboxing is needed but so much open source software is built on the Unix abstraction meaning you have to run in a container, but macOS doesn’t have containers as far as I can see, and containers themselves are a bit of a poor abstraction, although maybe the best we can do with Unix at the core. I think something closer to Roblox studio would be cool where when you open an environment stuff just spins up in the background, but there is a good debugger, logging, developer ide, good rendering, eg 3d graphics, separate projects are separate, and when you spin down a game (read app or project) everything spins down.