They do simultaneous workloads but each load is essentially performing the same function. A person, on the other hand, is a huge variety of differing functions all working in tandem; a set of vastly different operations that are all inextricably linked together to form who we are. No single form of generative algorithm is anything more than a tiny fraction of what we think of as a conscious being. They might perform the one operation they're meant for on a much greater scale than we do, but we are nowhere near linking all those pieces together in a meaningful, cohesive stream.

Edit, think of the algorithms like adding more cores to a CPU. Sure, you can process workloads simultaneously, but each workload is interchangeable and can be arbitrarily assigned to each core or thread. Not so with people. Every single operation is assigned to a specialized part of the brain that only does that one specific type of operation. And you can't just swap out the RAM or GPU; every piece is wired specifically to interact with only the other pieces they were grown together with.