TwoSix
Everyone's literal second-favorite poster
My stance is what it always is for D&D. Characters are unique, and I only have to come up with explanations for specific characters; no one cares enough about the cosmology to worry about WHY the Echo Knight can make a double of himself.It all goes back to how much suspension of disbelief someone is willing to give. My stance is since we can't agree what that line looks like, the safe play is to make it all magic rather than try to sort out what is talent, luck, ambient magic from the planet, etc.
If my player says their fighter is just a humble farmer who got really good at protecting his farm and can now behead demons and dragons, I roll with it.