Let's say you want to get a group of players together to do some organized activities. It doesn't matter whether it's logging, hunting, scavenging, or PvP. Now, let's also say the group doesn't consist of just tribe members. How do you communicate with each other without having to reuse /w commands over and over?
It would be great to form a party that allows you to invite members from other tribes so we could type /p and communicate easily without using /t or /w.
And, while things like a party UI could be added down the road, it isn't necessary for the time being. All we need is the ability to form one, disband after finishing, invite across tribes and homesteads, and talk in /p.