If you don’t interact with your party in LFD you won’t complete the dungeon. So yeah sorry but you most certainly do have to care about and work with your group in LFD. You wanna know what NPC’s won’t do but players certainly will do, remove you from the group if you ignore them.
And furthermore nothing about not having LFD forces people to use it as a glorified chat room where you have 4 people held hostage to listen to you babble like you seem to want. Most people you are pugging with do not care how your day was, we don’t care what your favorite color is, we don’t care what you had for dinner last. Maybe that’s a blow to your ego but you are not that special.