As long as each part of the hierarchy understands what they need to know at their level and what they produce, I have no problem with "the whole hierarchy".

You're saying this as if it's some rebuttal ad absurdum, when it's absolutely the case: when the higher layers don't understand what they do, we have a problem with that too, and that's been true since forever. Remember Dilbert and Office Space, and making fun of the ignorant middle managers and execs?

In this case, what we're complaining about is coders not understanding the code they ship (because some AI wrote it and they don't bother to review it or guide the AI fully).