Whilst you are polishing your halo and congratulating yourself on how wonderful you are I'd like you ponder on two points.
Firstly, not wishing to get out of bed at 6am on Christmas Day to entertain isn't selfish or representative of family estrangement. You seem to be making a parallel that doesn't exist to virtue signal how wonderful you are for being involved with your family. It's just not wanting to make your day longer and more stressful than it needs to be. OP will definitely have MIL over on Christmas Day, she just doesn't want to have to put on a show from 6am and that seems perfectly reasonable to most normal people.
Secondly, this idea that family estrangement is a modern phenomena is fairly wild, given how over the centuries young couples would migrate to different countries and never be heard from again as you couldn't just go home on holiday or even send a letter. You would just leave, forever. And this wasn't unusual. But of course that doesn't count because we don't think about the past in this way and we assume that everyone lived in the same village and the same street forever and don't have any context because it's people who have long been forgotten.
In terms of moving around, my family has disappeared all over the place since the 1830s at least. There's one couple in my family from Gloucestershire who lived in a village that was absolutely decimated as the whole cotton / weaving industry collapsed. More than 50% of the village were destitute and the parish were struggling to support them so they shipped loads of them off to the New World. My ancestors didn't do this. They instead walked to Leeds and never saw their families again. There was no extended family. Two of their daughters eventually moved to Texas too. And this is a fairly typical story of its time.
I've also got Irish Ancestry. My Irish family didn't leave Ireland during the Great Famine which is the opposite to many. They stayed. They started leaving Ireland in the 1870s through to the 1920s. Again never seen again by family. Some of them left for family alienation reasons - my great grandfather wouldn't speak of his family saying only that "they didn't care about me, so why should I care about them".
Suggesting that family estrangement is a new concept is absolute claptrap with no historical accuracy and pretty ignorant tbh. Lots of people might have written about it, but that doesn't mean they aren't writing complete bollocks based on modern day fallacies about the past.