You need it. I broke mine 30 years ago. There is nothing to do about it. I never stopped having trouble. I can't sit on a hard floor....it kills. Even sitting in a chair I do not lean back, my weight shifts forward so that it is mostly on my legs rather than my behind. I was six months pregnant when I fell down some stairs in a restaurant in NYC....that is how I broke my tail bone.
I hurt my coccyx some years ago falling off a moped, they said that there isn't much they can do for a broken coccyx. They do sell special cushions, or you can use a bath towel curled up.