people keep saying "don't use it"
well to be frank, if everyone uses it (only a retard wouldn't if this ever comes out) then the rest of us have to use it.

sure you can group up with your friends and LS mates and run the dungeon and events together, but what if you don't have any of that? now there is nothing stopping you from just going in and getting some random pt and doing it.
if enough people do this what are your odds of seeing the same people again? you wont talk to them again making you less likely to do any community interaction since its not necessarily important anymore to interact with people on your servers.

tl;dr randomly selecting parties from a large group of people makes you less likely to care about them when the said event is done. This only puts you in a solo bubble of your own and in a team game this doesn't help, it hurts.