It's almost certain the language came from some group trying to protect the three tier system and/or bars & restaurants. It's no secret taprooms are contributing to lower sales in bars & restaurants, and distributors (and large breweries) hate that smaller breweries can sell direct to consumers in many states. Even the Teamsters have been a thorn in the side of anyone try to expand direct-to-consumer sales here in Minnesota.
Really, breweries are manufacturers that have created tens of thousands of manufacturing & service industry jobs. Maybe they could shift their efforts towards ensuring these breweries can continue to grow and create more jobs, instead of killing their margins by forcing them to partake in a three tier system.