I am not an expert, but I don't think computational power is the limitation. It's the amount of data processed. Our brains are hooked up to millions of sensory

I am not an expert, but I don't think computational power is the limitation. It's the amount of data processed. Our brains are hooked up to millions of sensory signals, some of which have been firing 24/7 for decades. Also our brains come with some preformed networks (sensory input feeding into a region with a certain size and shape) that took millions of years to "train". Even then, our brains take 20-25 years to mature. Machine learning at this point seems closer to a tool designed analytically (feeding it well-formed data relevant to the task, hand-designing the network) than to AGI.