someone wasnt here when sated devour was a thing i guess, it shouldnt be about encourage more farming but making, farming, ganking and counter jungling all equally posible and balance choices, if lee sin spend all day ganking and amumu farming they both should end having the same impact i guess, but at different points in time, amumu should end being strong in teamfights, while lee should have give a nice lead to his team, on the other side, counter jungling amumu over ganking should make the lee stronger than amumu but both teams end rather balance, the difference being amumu is now not as strong in teamfights giving lee sin team an edge entirely base on that
when farming is too good for junglers you see things like yi and jungler farmers just afk farm until they get strong to kill everyone, if not then early game gankers run the game i feel all strategies should be efficient and have glaring weaknesses