> Junior devs have always been useless. You used to give them tasks that take them a week or two even though a senior engineer could do it in a couple hours, not because you wanted them to contribute, but because you wanted them to learn to contribute.

I don't know, I've known kids who can run circles around a lot of seniors, whether it's knowledge, coding chops or just intuition. The reason a newcomer takes a week to complete a task that requires two hours is because the senior has already learn all the ins and outs of the crappy software lifetime processes (usually dealing with half broken build / code review / ticket systems)