I bought a deep navy band and returned it as it was definitely darker than my deep navy iPad pro and iPhone 12 case.I don’t want this to seem argumentative, so sorry if it does. Even more so I don’t want misinformation going uncorrected however, and Deep Navy is absolutely not identical to Midnight Blue. There are 2 Midnight Blues that aren’t even identical to each other.
I posted 2 photos and @athousandbands another one that show the difference. It’s a richer, deeper blue and while I agree nobody ‘needs’ both I prefer Deep Navy because it’s different and better to my taste.
Maybe deep navy isn't IDENTICAL to midnight blue but tis definitely not the same deep navy as the other accessories I mentioned.