How many times have you read a story card and by the time you finished reading it you thought "It's an easy task, should take me 1 hour of work to write the code and tests"?
In my experience, in most of those cases the AI can do the same amount of code writing in under 10 minutes, leaving me the other 50 minutes to review the code, make/ask for any necessary adjustments, and move on to another task.