[OnePlus 6T  Questions & Answers] krabman:
My Friend, you are driving a Model A, it's cool to look back on but this is a modern Corvette, AKA, a performance value able to whoop phones costing twice as much even if it is missing a few Gucci features. I type that having sent the Pixel 3 XL back and buying this phone instead.

The Note 4 was a little before Samsung really started getting good with their cameras, I'm not saying it was bad, I had one and in the day it was great but they got quite a bit more serious a couple iterations later and it shows; their stuff is top notch now. The 6T on the other hand is not top notch now, it's a second tier camera and you can really see this at night where the 6T camera is a fair bit more noise. In the day it's not bad at all though outside of pushing too much contrast outdoors in HDR; the picture will almost invariably turn out with a bright sunny sky looking darker than the reality. Overall though I doubt you will find the camera a downgrade. Portrait mode is actually useful for more than portraits, for example it can make a picture of something like a statue at a museum pop out of the background and it's a nice effect for such photos.

Performance wise this phone is going to be a whole new world of slick, no rom can make up for vastly more computing power elsewhere and you're going to feel it every time you pick up the phone and manipulate the GUI. You're also going to appreciate the little things that OnePlus has injected into the mostly stockish experience. You'll find that OnePlus tends to be an enjoyable ownership experience stock, they are the type of phone that grows on you. Dont want stock you can run dead reliable stockish roms, alternatively, greatly altered AOSP runs which may or may not be , ahem, dead reliable. But that's all part of the fun.

One thing you're going to notice is that the aspect ratio is comparatively sucktacular. The tall thin thing is great for girls but I would much rather have the older aspect ratios. It's annoying as hell when you're surfing the internet in landscape and the website header scrolls down as you scroll down because it can block as much as half the screen and with these thinner aspect ratios that doesn't leave much wihch sometimes making surfing a pain. I'd totally jump on a browser which blocked that behavior, also a phone that went back to the older aspect ratio but I'm digressing. You may not be pleased with the change, all I'm saying.

Minutia... Duel sim is an interesting capability allowing you to ditch a separate work phone, buy data from one carrier, voice and text from another, etc. I think more people would take advantage of it if they gave it a try. You'll be shedding your unholy attachment to chargers and day by day the anxiety you feel when getting too far from a power source is going to go diminish. How much you miss the S-pen will depend on how much you used it. You indicate that was seldom so it shouldln't be a problem. While you may be stepping away from many features I think like most you probably only used a small percentage of Samsung bloat and you're not actually giving up something you never used anyways. The feature thing is not so big as some make out.

All in all I think you're being silly. I don't mean that in a bad way, I mean you've clearly become much attached to what is an ancient device in cell phone terms and your attachment is clouding your judgement. New phones are substantially better in almost every way, I would be surprised if you aren't very impressed with whatever new device you decide to buy.