The inventor reached out to several saw makers to license his new invention. None of them took it seriously. So he went and started a company with his new patent and became successful. Then other companies (Bosch specifically) tried to rip his tech off after they saw how effective it is, and he got to sue them and win.
Also, their patents are about to or have already expired (https://www.reddit.com/r/Tools/comments/p6bhhb/so_are_the_sa...)
Sounds like the 20 years gave him just enough time to:
1. Attempt to license the product and fail 2. Create a company 3. Market the company / product effectively 4. Exit ( https://www.sawstop.com/news/sawstop-to-be-acquired-by-tts-t... )
And now competition will begin to roll out their similar saws. I think 5 years would've been far too short for him. He would've been squashed. There would've been no motivation for companies to license his tech or buy out his company. They would've just waited 5 measly years and then stomped him.
Now. If this was software, this whole thing would've played out in what? 5 years? 10 tops? So 20 years, to me, seems to be about right for some things. but absolutely TERRIBLE for others.