Honestly I'd argue that that is more of a Google/large corporate problem. The thing about junior devs is that in order to hire a bunch of them and get anything

Honestly I'd argue that that is more of a Google/large corporate problem. The thing about junior devs is that in order to hire a bunch of them and get anything productive out of them, you need a ton of people above them. You need to spend more time on design to give them more clear requirements, you need more senior devs to provide mentorship, you need more management. Smaller dev shops don't have that, they can only bring on 1-2 juniors at a time and hope for the best.