You get 80% done in 20% of the time. The LLM shrinks that 20%. So a 100 task maybe takes 5 hours instead of 20 which is great. But the remaining 80 hours are not as improved. So a 100hr job takes ~85 hours which is very good.
This is in-line with Googles study showing about a 10% productivity increase and other research I’ve read. I suspect this will increase with more integrations and workflow adaptations.
But even after power tools changed how quickly carpenters can frame and rough-in a house, the finishing work (which uses power tools too) still takes the majority of the time.