It’s not just the DEA and such. It’s also the fact that these businesses, although legitimate and legal in the state, are still denied access to the banking system. They’re overwhelmingly cash-based, with the attendant risks. Oh, and the growers are often underwritten (funded) by far-away interests. Miss your harvest, and you might get a visit from Lenny the Legbreaker. Which creates a very strong incentive to steal the crop from your competitor.
Growing indoors alleviates these risks. But giving them access to the banking system is the real change we need.