I think it is a reasonably common trope in films/TV that a woman who gets proposed to by her boyfriend has made it in some way. But I think a lot of that is that finding a partner and commit to a life together is a reasonably common life goal, especially in the movies. Obviously it is not the only goal people have, not least because the day after the honeymoon people would then be at a bit of a loose end!
So I don't think it's a completely ridiculous, but when I think of the real people in my life married and unmarried and single, I don't see a hierarchy. I understand that sometimes relatives can bug single people about whether they have found "the one" yet.
But, I do wonder if this is a perception thing. Before I learned to drive (in my 30s) I had this feeling that I had failed somehow because my older sister had learned when she was 17, so I had a bit of a chip on my shoulder that I wasn't properly an adult yet because I had missed that rite of passage. I thought other people might think less of me or that I would be rubbish at it. But now I can drive, I can see that it is just a skill that I hadn't worked on before for various reasons and it didn't really mark me out as anything but someone who hadn't learned to drive yet.
So I can see how, if you have no intention of marrying or just haven't done it yet, you might feel like you have a neon sign above your head saying "unmarried" like I did with "nondriver" but most people on the other side of that line really don't think about it that much.
If the people around you do think it's some sort of status symbol and treat you poorly then they are weird!
I'm a bit jealous of single friends tbh. Marriages are about much more than the wedding day, and they aren't always easy/fun.
Is society set up for coupledom, certainly things like buying a house are easier with two - though we haven't managed to buy. Hollywood is pretty obsessed by romance etc. I get that as a criticism, if it feel like pressure.
I think whilst like most things male, single men probably do have an easier time of it than single women, especially in modern times. There have been expectations on them too, married men were seen as more stable and trustworthy - whether that was because of homophobia or just generally feeling that men with responsibilities were more responsible than younger men without. NASA's original astronauts back in the Mercury program were family men (one who was separating from his wife felt the need to pretend everything was okay in his marriage to keep his spot in the programme).
I'm not saying that's as common, but it's not unheard of.
And yes, house warming parties are a thing (pre Covid anyway).
Weddings, socially, function as an opportunity for the families to bond and for the couple to feel the wider support network around them. The guests at weddings (especially close relatives) get an oxytocin boost, the same chemistry that helps parents bond with their children.
Wedding gifts were originally about a young couple setting up their first home together, but may seem less meaningful when adults have living independently from their parents, alone or together, beforehand.
Do you think your observations about weddings and marriage apply to same sex relationships?