I can understand the need of trust system for easing queue time for specific role. Just a month ago trying to queue Doma Castle with my MNK and it took more than 15min to get a party.
Back when DF/PF is not available in MMO, I have to waste a lot of time shouting and forming and waiting for a full party to do anything even a noob dungeon, and if you join the game late where everyone have progressed to higher content aka eureka, I am Sorry
Even back in those day communitcation isn’t any better than now having PF/DF. Shout for a group, ppl join, say hello and start the fight, say goodbye once it finish and probably never see the same player again. Sometimes there will be chat, but so can DF/PF form group.
Socialisation happen in FC and guild, that’s what they are for