It's like the ship of Theseus for me. If all of the parts are swapped out, is it the same ship? I don't know, that's interesting to think about. But if all of the parts are essentially the same but worse for wear, with a shittier captain, is it the same ship? Yes, it's still Twitter.
It seems like everyone calling it x.com would allow people to use the name without having to know the history or be confused by just calling something X.
Kind of how pets.com was always called pets.com, because just calling something "pets" would be confusing.
This is what I do. I cannot call it Twitter anymore because that makes me sad (I miss you Twitter 2008-2016). I cannot call it X because that is dumb. So Xitter it is.