Newspaper articles are meant to be a bit troll like/clickbaity/overdramatic to get readers to respond, or set the writer up with a controversial viewpoint!
I think the whole "enjoying people but reducing friendship expectations" thing has been around on social media (even Mumsnet) for a while now.
Many emotionally content and happy people do just focus on their partner and work and hopefully have some allies for practical goals and ad-hoc situations.
With the WFH revolution and home entertainment being super easy it's incredibly easy to do this.
Some people find their face fits easily, or have a personality or the bandwidth to enjoy the hurly-burly of keeping up with people and groups!
I personally don't like doing this, and I'm happy with how I've developed as a person but often get the vibe I'm a bit "tolerated rather than welcomed" in all-female groups.
Plus have had bad experiences with bullying or users or overly competitive types.
So I'm a bit warier of joining in, as no-one wants to end up being the group punchbag, or being manipulated into doing favours for others to overcompensate.
Like @meimei80 says often people are fairly transactional and judgemental - if people think I have something to offer they're interested, but not otherwise.
I'm single now and content.
Sadly, the difference between how I'm treated as a "lone, midrange, content non-white female" to when people have seen I have a "rich well-connected alpha male partner" is like night and day!
I am open to finding new networks and ways of self-care but agree it doesn't have to look a certain way, just take what comes easily.
Loneliness is a thing for all of us.
I think trying too hard to engage with people when you feel your face doesn't fit is a green light for predators and bullying behaviour.
Not to mention a waste of time and money - I'm glad of the journey, but I do wish I'd stuck a lot of socialising money into a Mumsnet low risk Index Tracker or crypto!