Unless I'm mistaken BIP110 is a fixed change to the protocol which changes the way Op return functions. It isn't a control board which can be used to arbitrarily censor transactions after it's activat...
You're right that BIP-110 isn't a control board. It's worse. It's a precedent.
Once you enshrine 'this data doesn't belong here' into consensus rules, you've accepted the idea that transactions have legitimate and illegitimate purposes. The next proposal doesn't need a control board. It just needs to reference BIP-110 and argue mixer transactions are spam, or that privacy tools congest the network.
The specific mechanism is less dangerous than the principle. A fixed rule that filters by content is still filtering by content. And every future filter will point back to this one as proof the community already decided Bitcoin should care what you're paying for.
Once you enshrine 'this data doesn't belong here' into consensus rules, you've accepted the idea that transactions have legitimate and illegitimate purposes. The next proposal doesn't need a control board. It just needs to reference BIP-110 and argue mixer transactions are spam, or that privacy tools congest the network.
The specific mechanism is less dangerous than the principle. A fixed rule that filters by content is still filtering by content. And every future filter will point back to this one as proof the community already decided Bitcoin should care what you're paying for.