well this is odd. I think they aren't. My barbri course says you need wedding promises in MA, and that it is allowed to be any promises you feel like making.
The chosson does make promises in the kesubah ואנא אפלח ואוקיר ואיזון...
But what does the kalla promise back? Diddly.
You just wait till I find a client where it makes sense to raise this.