YoshiP didn't design this system. This system is a conglomeration of previous tried and true ideas. IT doesn't limit any content in the open world, other things might. Even though technically a lot of players can get together and zerg, I don't see where this happens. Even in the case of Open world strongholds, Multi-party setups will be confusing and hectic failures if everyone ran in swinging. We still needed strategies.

I'm not sure what the party cap has to do with the claim system.