Probably the lack of external stimuli. Generative AI only continues generating when prompted. You can play games with agents and feedback loops but the fundamental unit of generative AI is prompt-based. That doesn’t seem, to me, to be a sufficient model for intelligence that would be capable of “pondering”.

My take is that an artificial model of true intelligence will only be achieved through emergent complexity, not through Frankenstein algorithms and heuristics built on generative AI.

Generative AI does itself have emergent complexity, but I’m bearish that if we would even hook it up to a full human sensory input network it would be anything more than a 21st century reverse mechanical Turk.

Edit: tl;dr Emergent complexity is a necessary but insufficient criteria for intelligence