The line has to be drawn somewhere. The core game cannot have 100 classes. Lines have to be drawn.What end does drawing the line there serve?
While this can be a valid comment for some of these 5E discussions, I don't think it's fair in this case.So it's great that YOU don't want a paladin.
It's not so great that you don't want ANYONE to have a paladin.
Why? Because of the reason behind not seeing the need for a paladin class: the fact that a paladin character can be created, even if there is not a class called "paladin".
No one is advocating taking away the ability to play a character that can do the things that paladins do. The discussion is about whether that should be accomplished by simply having a paladin class, or having a paladin theme added to another class.
It's not about taking anything away, it's about how this something is delivered.