All bananas in a majority of the world are ripened in the presence of ethylene gas. Bananas left to ripe "naturally" are starchier and less sweet than the bananas found in stores. None of which is to mention that the varieties of bananas most humans eat are cultivated to have tiny, almost nonexistent seeds and lots of meat. Wild bananas look and taste nothing like the world's most popular yellow fruit.
That being said-to address the matter of "vine ripening" VS "off vine ripening". Many fruits and vegetables are in fact picked before they are ripen and ripe "off the vine" in fact, sometimes entire tomato vines are transported in order to have the tomato ripe "on the vine". If you have even eaten a fresh garden tomato you understand what is being attempted. Does it work? Eh. I would say it makes a difference but not enough to bother transportation of vines and the extra associated costs. But some disagree certainly. But none if these methods are unnatural.
That being said-to address the matter of "vine ripening" VS "off vine ripening". Many fruits and vegetables are in fact picked before they are ripen and ripe "off the vine" in fact, sometimes entire tomato vines are transported in order to have the tomato ripe "on the vine". If you have even eaten a fresh garden tomato you understand what is being attempted. Does it work? Eh. I would say it makes a difference but not enough to bother transportation of vines and the extra associated costs. But some disagree certainly. But none if these methods are unnatural.