Extra Attacks for Martial Classes

I just realized that only regular Fighters (not Barbarians, Paladins, or Rangers) get a third and fourth attack per action at higher levels. This is just another way 5E handicaps martial classes versus wizards. So, ALL martial classes (Barbarian, Monk, Paladin and Rangers) get a third attack at 11th and a fourth attack at 20th. College of Sword Bards who get their second attack at 6th will get a third attack at 13th, but do not get a fourth attack.