In the US you may have to change jobs frequently or accept pitiful raises. If your healthcare and social circle become too tied to one employer then leaving or being fired could be a huge change.
Building a professional network is important, and some bonding is natural, so I don't mean to discourage them. Though I do prefer seeking most social fulfillment through other means.
I agree, but I'm not saying anyone should only have friends where they work, but rather that you can have both.
I don't live in the US, and almost all of my friends I meet on my free time are not through work, but I do have colleagues who I consider friends and it makes work a lot more enjoyable. That being said, there's only very few of them who I would be likely to keep in touch with if they or I quit.
Building a professional network is important, and some bonding is natural, so I don't mean to discourage them. Though I do prefer seeking most social fulfillment through other means.