Going from an X to a 15 PM and you aren’t impressed?! I don’t believe you and something tells me you’re here just to trash Apple.
IOS is of course going to be the same, because Apple allows older phones to get support for so long which is a blessing, talk to android users. Up until a few years ago, You were lucky to get 3 years of Upgrades.
So yes, it may not seem like a big difference, but the hardware and quality most certainly is. If you can’t tell the difference in camera quality, battery life, display quality & build quality, then something tells me you’re not genuine.
Pointless.