I know this is a meme but Paladins are genuinely one of the most flavour-rich classes in the game.
An oath is a fascinating cornerstone of characterisation simply because a person, for whatever reason, has been driven to condense their permanent identity into a few words. It's this immovable pillar of their character magically anchored to the core of their being, and what's more? It's by choice.
You don't fall into a Paladin oath the way you might with a Warlock pact & nowhere does it say an oath's power has to be granted by another entity.
Every character has a core, but Paladins chose theirs. Taking an oath is looking at one thing, anything and going this. this is worth it. I will take this into myself and swear never to stray from it and it will inform everything I have been and everything I am now and everything I will become in the future.
Imagine loyalty so extreme it produces its own divinity and tell me that isn't worthy of a story.