My god, they should just release a detailed release note, those who care will read it, those who don't won't read it. Same with the macOS release notes, wouldn't see a problem there..
Apple will never do this. Why? Because it would embarrass them to know that you and I know about the terrible quality in their releases. The fact is they would not release near gigabyte updates if the changes did not require near gigabyte updates.
It seems based on recent history that Apple has a policy to just let crap out the door and fix it later, that release dates are set in advance and nothing changes them, that releases are narrowly tested on only current production hardware, that fixes are only issued when the public outrage reaches intolerable level or they finally get time to get around to it.
If Apple has a super secret project then no updates are going to be issued. I even suspect that beta software is released with just cosmetic changes aimed to make people feel better. Remember this, Apple is a marketing company first and foremost. It used to be ok because the engineering backed up the marketing, but with the loss of Jobs engineering does not seem to matter as much as cost anymore.