I think I also blame the wider RF for (not preparing Meghan's dad) it reeked of snobbishness. We're so superior, we can't deign to meet our prospective inlaws, they're commoners after all
TBF there's quite a history of sidelining the families of those who've "married in". It's not until the Middletons that it's become common to see inlaws at RF events, and that's almost certainly at the request of William
On a side note it'll be interesting to see what W&K do about where to spend Christmas, if it's Charles hosting instead of the Queen ...