Can you show me an aboriginal group that doesn't use spoons??
Your argument is ridiculous.
Are you saying that every book that a big publisher puts out is perfect?
Are you saying that every publisher follows best practices?
Are you saying that every publisher has ALWAYS followed the requirements that have just recently become required?
You see, there have been a crap-ton of books published over the last 10+ years...how long has it been since Accessibility standards have become required - by Law in the EU??? So... you saying that you haven't seen it (yet) from a big publisher really means absolutely nothing.
It means even less whether or not you use these requirements in your own personal books....
What really matters is that you don't come on this forum and tell people that it is not important, when in reality, and by law, it is required.
edit: another article you probably won't read...but is informative to those who care about selling their books...