This is also what I often wonder.

Imho, AI is a multiplier and it compounds more as seniority grows and you know how to leverage it as a tool.

But in case of juniors, what does it compound exactly?

Sure, I see juniors being more independent and productive. But I also see them being stuck with little growth. Few years ago in an year, they would've tremendously grow at least on the technical side, what do they get better at now? Glueing APIs via prompting while never even getting intimate with the coding aspect?