It's simple. AI speeds the 80% of development that was never the blocker.
Arguably makes the remaining 20% even harder to handle.
I'm sure that AI can be a huge boost to great, mature developers. Which are insanely rare in an industry that has consistently promoted brainless ivy league coders farming algo quizzes for months.
But those with a huge sensibility and experience can definitely be enabled to produce more.
But the 20% is still there and again, it's easy to make it way harder because you're less intimate with the brittle 80%.