I guess there is no other way than it being an optional feature because only Switzerland uses it for now. It's a successful way to deanonymize bitcoin users. But if you are using a centralized exchange in which you have already undergone KYC verification, your privacy is already screwed. Doing an additional address verification won't change much. Most of the coins getting withdrawn from exchanges are done so by the customers who transfer said coins to their own private wallets. So the exchange already knows where the money went. This is just a way to put a sticker on those addresses to be sure.