As you know, people still team together in solo skywars. Annoying right? And I guess they are in a party. So if you join a game. You are always next to each other, so they can build to their island and team easily. What if you don't spawn near each other. Like on the other side of the map? Shouldn't be that great? Also if you join as party and you don't want to team, you can go to your neighbours without looking to kill your partymate.