[humanrebar]

> But we can't just go around letting junior developers do whatever they feel is a good idea because "it's a learning opportunity".

I don't think anyone wants junior developers to do "whatever they want". That's not really what's being said, so refuting it doesn't mean much.

But these days, with deterministic deployments, virtualization, and containerization, there's a heck of a lot a junior developer can do in a harmless way. If they want to try applying a consensus algorithm instead of locking a database record, give them some VMs, express your concerns, and wish them luck. Most importantly, let them know what would make the project successful and what would make it a waste of their time.