I'm going to disagree with that. Spontaneity just changes a bit, it's not a boolean choice. You can spontaneously ask a friend to do something, and if they can't (because of kids or whatever) then you can schedule it. Is this less spontaneous than going over unannounced as a kid? A bit, yeah. But at least it still feels like fun. Scheduling friendships "like meetings" with "recurring events" is the polar opposite of spontaneous. That just feels like work.