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I totally agree with this plus if he was going to have problems with breathing it would probably be due to how thick the air is (I can confirm this as someone who lives up very high every time I go down somewhere it gets harder to breathe)
Sky's lung capacity is through the roof. Idk why people depict him as having breathing problems when this is the guy that lives at a super high elevation. The higher up you go, the harder it is to breathe. The less oxygen to be had in the atmosphere. If he has breathing troubles at all, it's because he lives where he lives and he'd be like...supercharged when he actually got down to the surface. I'm sure there are game mechanics involved in the logic that makes everyone write the opposite but please consider:
The rest of the chain visiting Skyloft and all of them *except* Sky getting KO'd by hypoxia cause *wheeze* holy shit sky how do you people *breathe* up here?!