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I think the impression you have of the people may have been influenced by seeing them primarily through social media. Have you talked to them in person? It might be different. The format of social media makes having nuanced discussions difficult, and emphasizes the more tribal posts.
Another thing to consider is that their priorities may have changed more than their approach to life. They may be applying empiricism to how to advance in a career, or how to be a good parent. There is a limited amount of time in a day, and they may have enough time to do only a few things well. Also, sleep deprivation, common among new parents, can make thinking clearly more difficult. Once children get older, parents get a bit of their balance back.
Interestingly, out of my original friend group, I am the only one who has gotten married and had a child. If anything, I have been forced to become more rational in order to cope with the added anxieties, lack of sleep, and stress.