When watching A New Hope, and the droids are trekking Tatooine, there’s meant to be an air of mystery. You don’t know what you’re gonna find.
The Prequels ruin that.
Not if you watch the movies in release order, like almost everyone does. Don’t take this as a personal attack, but by following your logic, the Prequels should not exist in the first place, because almost every single element of the Original Trilogy feels like that. The Jedi, the Dark Side, the Empire, Alderaan, and so on. You need to remove some of the mystery surrounding these things if you want to watch the Prequels first, that’s just inevitable.