Precisely, they literally said for longer travel - which is exactly the one time I can't charge and will be probably needing this. Operative word being "probably" as I mostly use my iPad on flights.Selling a battery back doesn't mean Apple is saying you're going to need this every day.
They can also sell this just saying that IF you need it one time where you expect to use it more than usually, all day long, and won't be able to charge, here's what we offer. That's it.
Apple also sells AirPods for the iPhone, doesn't mean you HAVE to buy them.
I get why this iPhone exists, I find it super appealing, I just dislike the display size.