Chaosmancer
Legend
I share that stance. And that's fine. Just say in the book that its a magical world and everyone has magic in them. It would change the default assumptions of D&D, but that's fine too.
But you have to be explicit about that. And 5e isn't.
Ah yes, no one would ever know that a world with magical elves, magical gnomes, magical dwarves, demonically blooded people, angelically blooded people, magical dragons, magical giants, magical plants, magical items, and people who use magic might actually be a magical world and many if not most people have magical potential. I mean, unless you spelled it out somehow.