Well, yes, but here the Pareto principle comes to mind, though.

I think it's more like the old adage 'the first 50% of the job takes the first 90% of the time, and the other 50% of the job takes the other 90%'.

Except that with vibe-coded AI stuff it's more like there's yet another 50% of the job to deal with the edge cases that takes yet another 90% of the time