This is so long overdue, players cannot bring friends into the game because there is nothing to do together. You have like 2 Duo Grind Spots and they're shit until you're hundreds/thousands of hours into the game when you can go Dehkia. Just make Grind spots have dynamic loot like almost every other co-op video game. Don't need to do any new zones dedicated to two or more players if you just change the system and give everyone loot. There is no downside to this and player numbers can go up because the people addicted to this game can invite their friends to play with them. It's a very bad experience not being able to grind with your friends except for very few spots that are mostly bad.