It has been complete opposite to me. It is practically impossible to do anything without someone constantly inviting me into the group. Even in the cases when it’s not really needed, like when doing “collect x amount of stuff” in area where there is plenty of spawns for everyone or even in cases where i am just running past someone.
It is common misunderstanding that social actions would come from forced interaction. Good, community building social actions come from voluntary kind acts of players towards others, for example: buffing others, helping people out, being friendly. I have had people come and help me when i overpull and i have done the same for others, i res people if i see them die, give greens to those who walk in white, grats when they ding and so on. The way classic world is built helps with this kind of interactions happening, because there is need for such kind acts. Not because people would be forced to do that. But i have definately received so much kindness and given it back as much i can. It has nothing to do with forced groupping.