Again, there's several YouTube videos proving otherwise. You can manual jump everywhere in that game. Odyssey and origins DON'T. Shit, odyssey erased the fall damage completely, you're factually wrong.
Of course you CAN'T climb everywhere, that's how real climbers work irl, on odyssey you can climb flat surfaces which is dumb and you don't have side projections or vaulting. AC1, the old ass game you're ridiculing does. Rose tinted my nutsack.