I was about to make the same distinction. Several LTHers attended an occasion recently, planned by another LTHer, that was meat-free but full of flavor, because the offerings were handpicked from several of the best middle eastern restaurants, food shops, etc. around town. Nobody there missed meat.
A vegan diet takes away so many of the things 99% of us rely on for flavor and satisfaction, though, that it makes it very hard to construct meals that seem pleasing to non-vegans. And I think longtime vegans don't have a clear sense of what other people look for; they're used to the much more minimalist satisfactions of their diet.
I'm not making any moral condemnation here, just saying that when you're far, far into your thing, whatever it is, you may not be able to judge accurately whether other people will enjoy themselves. But then the question is, is the wedding about forcing all your relatives to accept your terms, or is it about sharing joy and happiness with them? I guess I am condemning, a little bit, the egotism that is unwilling to bend in the slightest to ensure that relatives, some of whom will have done more for you than you can ever repay, enjoy themselves for a few hours at your event.