I like the idea, but you'd need to address these problems too - Drunk flying, Human brain's speed in comprehending things VS flight speed, and the force resistance of the wing feathers.
Also, it's not just flapping them that would tire the muscles, but also holding them rigid when gliding. Seriously, imagine getting a fairly thin wooden plank, putting it in between two rocks, and standing on it. nanosuitmuscles or not, tiring will still be a problem. If you take a long flight, and you're exhausted then what will you do to land, hmm? How will that work? No way it'd be soft, that's for sure. And we haven't talked about leg force resistance.
Oh, speaking of leg force resistance, wouldn't it be more strain on our legs to basically have a new pair of arms that weigh more?
Oh, and how would clothing work? Skin-tight insulated suits? Because traditional apparel is NOT good for keeping in heat if you're going at a high velocity, and mass is also a problem. How much do these "Nano-muscles" weigh? Or how they would work with replacing your legs?
Or the rates of medical complications from leg muscle replacement be? And the costs! Oh, the costs...
Anyway, to be more detailed, Drunk flying, like, drunk driving - That'd be an even bigger problem, because the safety levels would be worse than motorcycles - not that I have anything against motorcycles, I'm just saying it's dangerous.
Human's brain speed on comprehending things, like, if you're an actor, if you get fake punched, how long does it take for you to stagger backwards? Or, how good are you at timing things in a game? Or parkour! Best example right there: Parkour.
Another thing about clothing - Would you put clothing on the wings? The wings do count as a naked part of your body, soooo...
like, 8th edit: I have a feeling there are more problems that are on the tip of my mind, I just can't think of them. Argh!
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