Moral relativism isnt a character trait and not stickign to an alignment istn depth.
its the opposit of depth. it means your character has no principles. a character with no principles cannot have their principles challenged.
What you are saying is a very popular, but undercooked idea in roleplaying. it has come with the rise of 5 and Critical role and it doesnt understand the point of a roleplaying game.

What you discribe is the Moral equivalent of a Classless system. What it sounds like is that its a system that allows you to play outside of rigid forms and make your own character.
What it ends up beeing is a System wehre your character has no identity at all.

In my expirience only the most rigid class systems lets players act as a team.
Likewise, stringend rules of morality let players actually tackle moral issues.

Very few people are as good roleplayers that they can method act to the point of fully understanding the consequences of their actions in the world.
And even fewer players can suspend their disbelief so much that they feel actual empathy for fictional entities.
And even if one would be able to do that, its a game, not Improv theatre.
rules exist for a reason, because they need to be played out.

A paladin should have a strict code of laws that he must adhere to.


>Muh black and white moraltiy bad
Moral relativism is the most lazy writing possible and ironically Game of Thrones features some of the most stringend characters when it comesot their convitions, for every Cersei, theres a Stannis, who ends up with his convitions challenged.
The "morally gray" characters in game of thrones arent actually gry.
They are chaotic evil. At least if you go by Gygax definition of it (which isnt "i eat babies")

The idea that DnD Morality somehow means one dimensional cardboard characters is a meme perpetuated by people who havent an actual understanding of why Systems exist in a roleplaying game, and what the morality axis means to represent.
Thus comes the idea that a Lawfull good character is somehow less deep and basiclaly a rules lawyer, or that a Chaotic Evil character would constantly eat babies, kick the dog or kills NPCs.
Gygax for example talks about a Chaotic Evil character sparing evil NPCs and employing them, doing evil for the sake of a higher goal.
meanwhile a lawfull good character would execute them to prevent them from fallign to evil again.



TL;DR: You dont know what youre talking about.
Get off your high horse.