Sleep cycle is the only one I know and it works really well but it is subscription based sadly🫠

Since you don’t really use the camera that often and the apps you mentioned don’t take advantage of promotion that much I would say go for the 15. It’s cheaper, lighter and according to some tests has better battery life than the 15 Pro. I also like how aluminum feels in the hand more than titanium and the glass back feels softer than on the pro but that’s just personal preference

I think the home button was great for it’s time but it has no reason to still be around and is just a waste of space since we have found ways to navigate and use our phones with gestures and make the screen edge to edge.

I think the 15 series has this feature but it should definitely be on all iPhones