See, this is one of the reasons I kind of dislike the whole Santa thing altogether (and honestly, I am not some joyless monster who doesn't want children to be happy. ...).
Because what about children living in poverty who get little or nothing? On top of their other miseries, are they supposed to accept that Santa just didn't love them/care about them at all/as much as he does wealthy children?
Also seems harsh on kids who are Muslim, or Jehovah's Witnesses, or any other faith that don't celebrate Xmas (Santa only loves Christians and Christian-celebrating atheists?)
I realise the whole Santa mythology is incredibly popular on here, with children apparently "believing" even up to secondary age......(I have worked with secondary age kids for decades, and have to say I don't think I have ever met one who actually thought there was a guy in red who flies through the sky on a magic sleigh delivering presents.....)
To be honest, I do think it's a little weird, that we all try so hard to convince our kids of something that is, in fact, a lie. And that when children try to apply logic to it, when they work out it's obviously nonsensical, we then just lie to them even more, in even more cunning ways, in order to defeat their (correctly applied) logic....
And the poverty argument - it's an even more pressing one not to do the Santa thing - or if you must, please don't make it the main thing about Christmas. The idea of Christmas being a time for celebrating with family, friends, neighbours and the community; for kind and generous gift giving, thoughtfulness and love; and for thinking of those less fortunate than ourselves..... THOSE are magic enough.
OP, you sound like a lovely, thoughtful parent. You are setting your child a wonderful example if you continue to make Christmas a time when you consider and try to help those less fortunate. The mythologising, if you must do it at all (and I realise most people do) should surely come second to that....