With every new generation the charging power drawn increased so yes I might have a bunch of old chargers as backup but none of them can charge as fast as the newest.
What a ridiculous argument. Chargers from the same company that brings you the phone tend to be the highest quality due to rigorous testing. If first party chargers aren't very good then third party ones are unusuable.
Remember news of all those "exploding" devices? You guessed it, third party chargers.
Usually they ship cheap ones, which charge relatively slow. They definitely work, but if you have bought any other device with a charger you likely already have one just as good.
To be honest the worst cables I ever used where apple ones, coincidentally also the most expensive. (And including cables is pretty okay, I think)