The only thing you need to know about EV is this: If an attacker puts up a MITM site with a valid DV cert, your browser will be like, cool, let's use this less-

The only thing you need to know about EV is this: If an attacker puts up a MITM site with a valid DV cert, your browser will be like, cool, let's use this less-verified cert instead, because a CA signed it, even though the last time I visited it was an EV cert. Your browser doesn't care, users don't care, it doesn't actually improve security.