My 2 cent theory about the limitation of Dolls is to fit the philosophy of the majors game changes, like no-knockdown for example.
That amplified feeling of danger while playing is a nice touch to balance the powerful custom gear available.
Also a "Game Over" from time to time (which is not that punitive in my opinion) is a good message to think about a game-plan to complete the run.
And as Obama says... With great power comes great responsibility
btw you still owe me 500k spent on moons