[chx]

Let me add a personal anecdote: my uncle has developed a better sprinkler head. Think of bearded inventor tinkering in his garage for a decade. This was late 80s /early 90s so not much CAD was involved.

This is where the patent system shines. Because he got a patent he could shop around, sell it to a company which made a tidy profit on it. He didn't need to raise capital to establish a factory and all that to bring it to market and the company buying it seriously got ahead without spending an inordinate amount of money and time inventing the thing.