Also, after the 2008 crash, food doesn’t taste as good at certain places.

Chain restaurants that used to be really tasty, started using cheaper ingredients (theory) and just don’t taste as good as they used to and it’s more expensive.

Yes, this is a major one. Go to any country with cheap restaurants and Lo! They are jammed with people hanging out.

Even as early as 2015 I was often shocked how few people entertained or wanted to do potlucks. I soon learned why, at least in my circles the lack of effort was mind blowing. Most people balked at the idea of chipping in to buy food, and so when I'd try a potluck everyone would aim at bringing something fully prepared like "Chips and Salsa" (and like 5 people would bring that).

I finally gave up trying to entertain folks, I'd rather go out and eat a good meal and only pay for myself rather than be the only one spending $100s on parties... It saddens me because I had a time in my life where I did have a good circle that was reasonably reciprocal. I guess it's just a gone thing?