Another reason privacy is essential is that the state can change what is illegal.

The state can decide to persecute things it did not before, so the less information the state has on you the safer you are.

This is one of the biggest arguments against fighting for reform before revolution. Reform almost always involves giving the state more information to work with (like whether or not you are trans) so it can provide more services on that basis. While that can be better than nothing in the moment, I fear for all my friends who have given the state that information.

A great way to give a bit less information is to wear a mask. Covid is horrible, but it has given us an excuse to safely wear masks in far more situations than before, and gotten people started on the idea.