I think it's a decent question, assessing tech talent is hard, oftentimes, building great things like React or Cassandra is also a matter of opportunity, working at big companies means you have hard problems that require you to spend time designing such systems. It's hard to say that others couldn't have similarly solved it, or even done it better.

That doesn't mean it's any less impressive of the people who did build all this, but I just don't think we need to compare, we can recognize the accomplishment on its own.