The ceiling is effectively "wherever it first breaks beyond the maintainer's capability of fixing it." Once development can't get past a given problem, it's hit, at least temporarily, the ceiling.

i dare say, with nothing but the intuition gained through decades of practical experience (as opposed to studies and numbers) to back it up, that the ceiling for someone with zero coding experience is not very far from the floor.

Edit:

> Trying to separate hype from reality.

<https://news.ycombinator.com/item?id=47701971> just showed up in the feed and seems particularly applicable here.

One relevant snippet:

> Real products need experts and it is of extreme difficulty to become such an expert if you don’t possess the expertise from either your own effort or watching more skilled colleagues.