I don't think you really get why enterprises buy managed cloud services, or why consumers buy in general. Your purchasing criteria seems out of tune with what consumers care the most about: selection, price, service.
That still doesn't explain AWS v Azure or GCP which have similar (or better) services, more than competitive pricing and in Azure's case, waaaaay better support.
In fact, everything about AWS is typically worse. Perhaps AWS entered the 'no one ever got fired for buying AWS territory' even when there are a ton of better options out there. If that's the case, kinda sucks for devs who are stuck using their crappy services when so many others exist.
Agreed that the console's UX violates almost every UX principle in terms of its use of signifiers, etc.
We literally have AWS technical generalists on-site once a week and they bring in subject matter experts on specific topics/services as-needed, sometimes on-site, sometimes via video.