Unless I go to the gym and don't plan to take off my Airpods prior to my return, I would be carrying my charging case (i.e. to work, uni etc). It makes no sense not to. If you are going to be in an environment where you may be taking off your Airpods regularly or even once, I am sure it is an environment where you can easily take your charging case with you.
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You are not wrong, infact quite correct that ideally everything should be USB-C for their vision.
However to switch everything to USB-C, would mean that everyone who currently owns USB-A/Lightning accessories, will get shafted.
Now MacBooks make up a much smaller group of people compared to iPhones, they are much more likely to not rock the boat for iPhone users. As a point in case, when they removed the headphone jack on the iPhone, due to how large the market is, they included adapters rather than making people buy it separately. The new MacBook users however, did not get any such assurances, despite paying quite hefty premiums on their products.
When iPhone 8 comes out, will they ditch the lignting and go USB-C? I think they should for homogeneity. But the sad truth is, probably 98%+ iPhone/iPad users don't use Macbooks. So they have very little incentive to rock the boat for them, as opposed to the 2%.