It's none of the standards business. Those flags can never be more than advisory.
* there are users who need these bits
Default to off, let them turn it on. Kiosk mode. Don't inconvenience everyone.
* it is a basic courtesy towards the content generators to abide by their license, just as we expect others to abide by our licenses.
So if I write in my document that you need to wear a pink fedora while reading it, you'd want a program to enforce that by default? It's silly. Let the reader decide whether what the author demands is acceptable or not.