> These are completely unfounded guesses. You have no basis upon which to determine whether it's "difficult."

Those are guesses, which is why I used "probably" and "it’d be". Glueing parts together takes less space so it makes sense they use that to make phones thinner. I’ve yet to find a single smartphone with the iPhone 7’s thickness and a replaceable battery. The Fair Phone has a replaceable battery, but it’s thicker than every iPhone since the 3GS from 8 years ago.