AI tools can dramatically accelerate output, but over-reliance without deep understanding creates "Hollow Seniors" who appear productive but lack fundamental problem-solving skills. The "Rent vs Own" framework helps engineers decide which knowledge to delegate to AI (just-in-time execution) versus which skills require deep mastery (just-in-case learning). Senior roles demand intuition built through owned knowledge, not just AI-generated outputs, especially during critical incidents where speed and understanding matter most.
