I can understand that. The black slate 5 was a great looking phone, very sleek. I was excited about the 5 when it came out because of the unibody aluminum. I was doing screen repairs and such as a side gig and everything after the 4s was SO MUCH EASIER to repair lol.
But IMO the iPhone 4, at a time when everything else was cheap and plasticky, was one of the most impressive pieces of engineering I had ever seen (especially when I opened it up). I loved the contrasting black glass and silver steel frame. It just felt very elegant, and everything after felt cheaper. The difference between the iPhone 4/4s and the iPhone 5 to me, feels like the difference between the Stainless Steel Apple Watch and the Sport. I had a Sport for a while but it never felt worth the money. I tried the black steel watch, and that had the premium feel I was looking for. Even though it's more expensive, that one felt worth it.