it's very hard to control your play group when that includes games at a store or CommandFest

Correct, because some of those players will not have the same opinions as you; hell, some of them may actually enjoy UB releases. They also can’t control you ([[mindslaver]] and similar cards notwithstanding 😉).

We have public games, and we have private games with friend playgroups. It’s not a bad thing for public games to be more inclusive, especially in casual formats like commander.