I'm not entirely sure what you mean. But if we're talking about AWS cloud services, there are certainly AWS experts who know how to develop software in a cloud-native way and utilize most or all of the relevant services. That knowledge is what we are paid for. It's also true that there are a lot of AWS services available and expertise is divided into different specialty areas, like ML, IoT, etc. Hard to be expert at everything.
That's a good seam upon which to filet this analogy. A quick Google search turns up uncertainty as to how many different bricks there are. It could be in the 3000s, 6800s, or over 12000. We are all ignorant of the available lego blocks.