Comment by IshKebab

I think it's unlikely that individuals will need their product, unless you happen to have a 100 million line monorepo. (At least based on what it sounds like they're targeting.)

Normal Git/JJ is fine for most people, and most open source projects. It's just when you get to the scale of commercial software companies (100+ employees) you run into the classic monorepo/submodule problem.

Monorepos are currently the best solution - they make testing tractable, you can do cross-project changes, Git's support for them isn't buggy as hell. But they have obvious downsides - performance is the big one, but also integration with open source projects, permission control, etc.

So there's this big problem space that really only matters to companies where as far as I know there are currently no good open source or even commercial solutions. The only people that have (maybe) solved it are the mega-corps like Facebook and Google who have made their own private solutions. I don't know exactly what ERSC are going to offer but it's surely going to be in that space and also probably not going to be super relevant to private individuals.