This.
Nothing bothers me more than a party that actually bothers to wait for the slowpoke, especially after I've tossed a full party buff on 5/6 characters, and ended on a Haste. And then they sit around, waiting for that one guy who is coming from Harbor to Upper Necropolis and getting boat buffs while at it, instead of just getting on with it. Most of the game is shortmanned without that one guy. He can have late entry EXP penalty, for all I care.