The article is about how Apple is underdelivering in browser features and compatibility while pretending they aren't. It's about Apple. Apple. The ones responsible for a great many features not being supported in all browsers.
What does a web dev have to do with Apple's choice? How do you improve Safari by not using features it doesn't support? What does your comment have to do with the argument the article is making?
What does a web dev have to do with Apple's choice? How do you improve Safari by not using features it doesn't support? What does your comment have to do with the argument the article is making?