Vengeance Paladins are not real Paladins

[Tanarii]

In forgotten realms, all Paladins, per SCAG, subscribe to an additional set of Tenets to one degree or another. IMO some of those tenets class clash with the Vengeance tenets. I think it'd be very hard for a vengeance paladin in that setting to maintain his tenets. They're very strongly oriented to a 'classical' D&D Paladin, clearly deriving from what would have gone hand in hand with LG alignment concepts in previous versions.

So for FR, you kinda have a point. For any generic PHB only setting, you're wrong, at least as far as 5e goes. Because the PHB defines what a real Paladin is, and that includes Ancients and Vengeance Paladins.