> I know it's meant to stop idiots from doing work that could endanger them and others
Yes, and it's a lot bigger problem than you might think. You know what you are doing, but 99% of people don't, and they will happily murder the next owner / next occupant through their own malpractice, without even thinking once about it. I've seen professional home builders screw this up and fail inspections, multiple times. It's a real and common risk.
That is _not_ the person I want working on a gas line (which is "plubming") on a house I'm going to buy in the future.
I'm sure you're a special little snowflake that's good at everything, but if you don't feel comfortable getting a permit for permit / license-required work, then... um... maybe you shouldn't be doing it? That's the context for the advice I gave to the parent poster.
Now some dickwad comes and tells me "man, that is illegal". k