Have you personally handled the iPhone XS Max yet? I mean, aside from reading the tech specs, the difference between the iPhone 8 Plus and iPhone XS Max is only 6g of a difference, which is not *that* much of a difference. Where the iPhone 8 Plus= 202 g and iPhone XS Max =208 g. Then if you had a case on top of that to both phones, I don’t think the user will notice that much of a weight difference.