To account for something is to track it, and to track it there needs to be controls. Ownership of execution spans a distinct temporal boundary.
There is a difference too between the letter recipient and the owner. For the latter, all labor exerted equates to all rewards reaped, which is at most fractional for the other. Total productivity capture disadvantages nearly everyone.
Regarding demographics, have yet to see an economic model that accounts for imperfect rationalists, or idealists, optimists, and romantics.
