This is mostly about not lying to our kids, for us. We don't do the tooth fairy (though the eldest has gotten lost-a-tooth-money) or easter bunny (though we still hunt eggs) or any of that shit. We just, like, wanna be super straight with our kids all the time and not undermine their trust by perpetrating a multi-year hoax on them.
Not that finding out Santa isn't real broke my relationship with my parents or anything. IDK. It's just a hardline principle thing we decided.
And no shade on you if you do Santa with your kids. You gotta do you. This is just us doin' us.