I think the Double 1st base could be a problem in two ways.
Take 1: Very poor underfunded teams that play at public parks or bad home fields , getting the Double Bags purchased & installed . Especially in the public park domain.
Take 2 : Here in AZ when teams are privileged enough to rent a MILB field or Spring Training field , numerous times I have played HS FED games with the bigger pro sized bases. no one said a word but technically not legal