LHC ultimate party setup.

^ Woah that's a bit harash. Seems reasonable enough to me that a a bishop go around buffing party members, and fulfilling its role in the party, instead of the entire party halting its attack, just to go get hs/bless.
That's just my 2 cents..

Depends on who the bishop is. In the parties I've been in, it's often somebody's mule on a second computer.

Also, HS is not the only party buff used, usually. CO, SE, MW, Haste... If the party is not cycling the map together, it becomes impractical to keep everyone buffed, unless all gather at one spot at the same time for all their buffs.