FrogReaver
The most respectful and polite poster ever
It helps to understand the relative power level of every feature, to gain a greater and more holistic understanding of the entire class. That's an important part of System Mastery.
Both Paladins and Bladesingers get extra attack. Extra attack is far more important to the Paladin than to the blade singer. The feature itself isn’t what is or isn’t strong. It’s the package it’s attached to. Paladins get abilities that work with multiple attacks. Wizards don’t.
Extra attack is very good on a paladin.
It’s merely flavorful on a wizard.
A person with any amount of mastery you quickly comes to realize that in 5e abilities are more intertwined than stand alone and so trying to rate them as if they were stand alone will always fail.