Why not ask if people would prefer an 84 hour battery life seeing as specifics don't seem to matter in these forums.
Because 74wh was what the last years 13" model had? Sounds like a good base line to compare with no? Or do you just want to be difficult for the sake of being super pro-apple?
Perhaps OP should first ask Apple to develop the new model with the 74wh, get actual real time results of the battery times - before creating this post? Would that suit you better? /s