Every WordPress website should have a favicon and luckily adding a Favicon to any WordPress website is incredibly easy. There’s no need to install extra plugins that slow your site down, there’s no need to “look in your header” file for a link rel attribute because that will make the favicon theme dependent, leaving it vulnerable to upgrades.
Picasso had a saying. Good artist copy. Great artists steal. And we have always been shameless about stealing great ideas. – Steve Jobs. These are the ideas Apple did not make themselves.