It's like typical "I don't need anything for my birthday". Even the most rational people tend to get disappointed if they really get nothing.
After rationally agreeing not to get anything (because we were about to move overseas on a couple of luggages and didn't want extra stuff) my SO got me 3 (3!! usually it was one per event) gifts and I was empty handed.
And I had to resell / returns some of the items as we were moving anyway and we could just buy better quality stuff later on, without having to pay for the move.
Never thought of that. I'd imagine the ensuing conversation is even more problematic though? "What do you mean you don't have a birthday? That makes no sense!"
Maybe could also tack on that you count winters to tell your age.
I mean, if I have to put it on a form, that's one thing, but like office people don't need to know when it is.
I'd be much more disappointed in some useless trinket I don't need and would feel obligated to keep.