Well, if you narrow down the metaphor to just knives, a dull knife is more dangerous to a chef than a sharp knife, because you need to apply more pressure and you get less control over the cutting action.
This affects amateurs just as much (if not more) as experienced chefs.
I don't think the analogy is very good, since juggling katanas is always a crazy idea, while choosing whether to go serverless or not is always a respectable discussion.