There is a reason there are 56 portals and not just 7 portals for 8 man teams.
BA was designed to be pugged.
If people want to go premade and they dont get the portals thats just tough luck.
First come first served.Thats the way BA was designed.There is nothing to stop all these people making teams once they are inside and setting up discord server once inside for the groups.
Simple matter is only reason premades are angry is because they cant get all their buddies in to get rewards.