I think it's also a bit of the mercenary mindset mixed in there as well. I feel like people don't want to mix or try to make friends with their coworkers anymor

I think it's also a bit of the mercenary mindset mixed in there as well. I feel like people don't want to mix or try to make friends with their coworkers anymore. I get wanting to have boundaries between work and life, but I feel like most people interpret it as "Don't become friends with work people" instead of not talking only about work with work-friends. Anecdotally, most of the people with this view I found to already have a good group of friends whether from college or from earlier work/social situations. It feels a bit rich to say that you shouldn't make friends with coworkers when your social circle is already full.