I think I've lost the analogy here a bit, could you help me? I thought "alchemy" were general purpose systems meant to get you off the ground.
I'm nominally one of these "$500k+ FAANG superstars" (though I'm not actually a superstar) and nearly all of our engineering time is spent wrangling home-grown abstractions built specifically for our business needs, which don't feel like "alchemy" in this analogy. Certainly a few teams are more involved with AWS services, linux, and dev-tooling but that constitutes maybe 5% of the company.
Would you still describe this other 95% as "alchemy"? If so, why?
The FAANG-ist is one that can pay that opportunity cost quickly and completely, such that they are able to reason about the system with confidence, particularly when it comes time to reverse a feature or bug request into a set of commits. Or, more likely, a set of experiments and commits based on the outcome of those experiments. Given that there is no unified language of application design, doing this requires detailed, specific knowledge of every sub-system involved, the abstractions their authors used, and the ability to translate between them such that you can imagine the entire causal change from input to output. This is hard, and it's why you make the big bucks. (Interestingly, I first wrote "bugs" instead of "bucks". :)