I always thought it would make sense to let us handle Xmas duty so others — people for whom it really, really matters - can do their Xmas stuff.
I used to try to volunteer for this when it was relevant (really, it’s not a thing for me), but I rarely saw a systematic opportunity to do so.
I think it gets harder as time goes because the replacement day (say a random day in Jun) isn’t as quiet because the rest of the economy is not turned off.