I would disagree with that. Flying is both a convenience and it allows players to get a different perspective on the environment that they'd never get walking on the ground alone. It also allows for more varied and interesting environments if they're made with flying in mind. I mean, something like azyz lla or the sea of clouds wouldn't really work if you were grounded the whole time through. That being said the only thing stopping you from looking at the world in detail is yourself. You don't have to fly. You don't have to ignore the world. You choose to because you want to. You can always walk around everywhere if that's what you want to do.