The fact is, Apple can and will fragment everything on the iPhone devices because we allow them to. Also, the vast majority of iPhone users won't care/notice these pet peeves we see and complain about. You see that very same example in here, people refusing to believe the 6+ lags. It really does. It's not a myth.
If people actually fell through with their claims of "jumping ship" and leaving iOS and Apple altogether, maybe Apple would make a change. Until then, yes they can craft a beautifully sculpted device and cram tons of outdated materials in it and call it revolutionary.
I bought the 6+ and I will be keeping it until I am due for another upgrade but I can honestly say that I was expecting a little more bang here for the extra $100 over the 6. That should have at least warranted a better RAM solution, like 2GB. It just makes sense. A bigger phone designed to do more should be equipped with more. But I guess that's all apart of the business.