[gravypod]

> people entered the industry after docker images became popular

I don't think this is the only reason people use docker. Docker let's you compile an artifact and deterministically recreate that artifact at any point. When you want to deploy this artifact everything is hermetically included in it. No network access or startup time. Just starts and it's good.

If you have VM tooling that lets me do that without spawning a VM repeatedly and doesn't give me an effective way to modify the FS & copy my programs in (packer) then let me know. I haven't found anything VM related that's simple to use

In addition: vms still have a performance hit much more significant than processes.