Eek, I wish I hadn't capitulated so quickly when iOS 11 came out and my wife complained and complained about performance issues on her 2-year-old iPhone 6 until

Eek, I wish I hadn't capitulated so quickly when iOS 11 came out and my wife complained and complained about performance issues on her 2-year-old iPhone 6 until we just decided to buy an 8 and be done with it. It's not like she would be willing to move off Apple, and we had the money. I doubt my situation is unique. Oh well.