We have a way of turning holidays and celebrations into stressful obligations. When we've missed the point, the celebrations aren't worth it.
I've turned virtually every birthday event/party thrown for me into a plan that I help develop, and into things that end up having nothing to do with my birthday. I don't particularly care about my own birthday but will gladly take advantage of an excuse to take a vacation or get together with people.
If two people come to the mutual conclusion that birthdays and gift-giving is irrational and not worth the trouble, and they demonstrate that they care about each other ways, who are we to stop them?