Yes, I agree. What I'm finding, though, is everyone else in my circle doesn't value meeting in a restaurant. They insist these things should be in a home. Or if it's a restaurant, someone should pay for the whole crowd. And as you can imagine, it eventually becomes a "I do all this effort to invite family X to our home for parties, but they never invite us to their home" - conveniently forgetting that family X does want to spend time with them - just not at their own home.

I also found that they seem to value the tradition and style (quality of food, quality of dinnerware, quality of decoration, etc) much more than the company.

Before marriage, we (guys) would get together often. After marriage, it promptly stopped. And the accounting began.

As I said in another comment, the causes of the decline are plenty, and nothing really dominates. I've given a few reasons here and elsewhere, but I'm sure there are many more. It's a death by a thousand cuts. The reasons I give here are due to a certain sub-clique. It won't apply to others' experiences.