The "K-shaped workforce" framing is real and probably underappreciated. Senior engineers get more out of AI because they can evaluate the output, catch the architectural mistakes, and debug the edge cases. Juniors using AI to write code they can't read aren't building the debugging instinct that makes senior engineers valuable. That gap compounds over 2-3 years. The question isn't whether to use AI. It's whether you're actually understanding what it produces.