You specifically mention building friendships. What it takes to build and maintain friendships can be different. Once friendships are built on the back of a shared experience, they can survive the loss of that shared experience, if the parties recognize that things have changed, continue to value the friendship, and understand that maintaining the friendship will require a different kind of commitment and different levels and styles of interaction.

I'm not saying this is always easy, and sometimes one or more people in the friend group just decide that the friendships aren't that important to them to maintain. But it's absolutely possible, and can be very rewarding.