If your phone is not defective, or in need of a software restore, then I must have lucked out and gotten a special model. I've never experienced a lad, or stutter. The SE is not like other iPhones in that it was released with the same technology as the flagship phone a year and a half ago, technology that is not much different than what the 7 offers. It will wear much better than older phones which had processors that tended to lag behind their software ambitions. There's not a huge difference between the iOS 9 & iOS 10 in terms of feature demands.
If you take a lot of selfies, and high quality selfies are an important feature to you, all I can say is you had no business buying an SE. As for 16GB phones, again, there's nothing wrong with a 16GB depending on how someone uses it. It's not surprising Apple is trying to keep their profits high -- and it's not just from continuing to offer 16GB chips in their products even as the rest of the industry moves past them -- ALL of Apple's products have incredibly high margins. Blaming the SE and 16GB products as examples of Apple's greed over customer satisfaction, is hypocritical assuming you believe Apple's premium products are otherwise acceptable. The reality is, both of those products address underserved areas of Apple's market, without sacrificing profit margins, making affordable entry level devices, which may serve the customer who buys them perfectly well. How many other phone manufacturers even make a full featured smartphone which operates more or less on par with more premium products, the size of the SE? Other companies aren't even serving that market at any price. As a long time Apple customer, the SE is the perfect phone for me. For the price, I couldn't be happier. Had Apple priced it more like the 5c, I might be nitpicking it the same way you are. But this is the least greedy move I've seen Apple make in a long time. Very happy customer here, and expect the SE to be a workhorse for far longer than my previously purchased new Premium iPhones.
If there is nothing wrong with 16gb in 2017 why would Apple drop it from their entire product line and make 32gb default? Your reasoning makes no sense. The fact Apple is doing 32gb now is an admittance that maintainig 16gb was inadequate for today's smartphone demands. As an example, any good game or even Apple's apps can easily be around 1gb each, couple that with other media, and it's obvious to see how 16gb was unsustainable and changing it was long overdue.
But hey reality distortion field seems alive and well here.