This is an extremely odd issue, and unfortunately, there is precedent for Apple not fixing odd issues that don’t affect a lot of people. The vast majority (maybe barring a handful of people) must update via OTA, otherwise there’s no reason for this not to be fixed yet.
There is an activation bug for A9 devices on iOS 9. Apple deactivates the device (any A9 device: iPhone SE 1st-gen, iPhone 6s/6s Plus/iPad Pro 1st-gen (9.7 and 12.9)) and you have to update iOS to get it back. It doesn’t affect many people, and Apple wants us to update, so they don’t care.
This isn’t the same in one way because Apple wants people to update, but the requirement of “a lightning cable that’s USB-C and iTunes” might be uncommon enough for Apple not to care. Otherwise, there's no reason for this not to be fixed. Like I said, this is quite abhorrent: what if the user were somewhere with no Apple Stores? It would be impossible for them to fix this. Hopefully they fix this and it doesn’t go unfixed forever like the activation bug.