It has dev environments now too! https://developer.1password.com/docs/environments/
So adding a new collaborator to the project would involve adding them to the vault, then there is a shell script in the project that uses the CLI to write a new `.env` depending on the values from `op`.
Seems like this new environment stuff wouldn't add anything compared to such setup, at least today, is that fair? Seems to be even more manual and require copy-pasting, unless I misunderstand what the feature actually is.