Maybe by "we don't know if it's possible" you meant "we don't presently have a step-by-step plan to implement AGI using the tools we already have in our toolbox

Maybe by "we don't know if it's possible" you meant "we don't presently have a step-by-step plan to implement AGI using the tools we already have in our toolbox, and no new ones"? If so then I certainly agree. But when you look at, say, Sora's videos... How certain are you that there's no path between that and the human visual cortex? How certain are you that they aren't solving at least some of the same problems in structurally analogous ways? Given that nature built a visual cortex (more than once!) by applying survival pressure and turning a crank, just how hard can it be? When we apply a bunch of optimization pressure and billions of dollars turning cranks and something eerily similar pops out, that tells me that there's just less magic to our own brain than we thought. Like when spent centuries wondering if our solar system is unique, and then we finally put Kepler up there and it turns out that planets are everywhere you look.