You say that like nobody of Hacker News knows anybody who is a land developer.
> some existing thing that didn't need permission when it was done 40-140yr ago
Not every law ever written has grandfather clauses, and where water rights are concerned we are quickly running out of patience for grandfather clauses.
> no matter how hard people may dishonestly try to imply otherwise
Hey you know what else is dishonest? Making a big conversation with wide ranging consequences have to pause to talk about one particular line item you have a problem with. Agenda or no (which you are projecting on others), the results are the same.
Every city is worsening its watershed - through development - except for the few that are actively fighting against it. And so many families are getting burned out by wildfires because we keep increasing the density of cabins out in the woods. It's not isolated incidents when you have 5 million or even half a million people living in a county all trying to do their own thing without The Man trying to stop them.
No single rain drop believes it is responsible for the flood.