Except it's all a facade.
They did their jobs in the past (convert pagans), why not change christmas to christ's true birthday? (I'll set aside for the moment that no one actually knows for sure when Jesus was born). Why not eliminate easter entirely, and just have a traditional mass celebrating the resurrection?
Why celebrate his birth at all, when celebrating any birth was never a christian tradition until around the 3rd or 4th century as the church was working on adopting holidays and rituals in order to convert pagans?
Continuing them now is just maintaining the charade. They were forged under false pretense, and they continue to this day under false pretense. It's using christ as a band-aid to "fix" pagan holidays, while still observing the rights and rituals performed on those pagan holidays.
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