You would not upgrade from the 5 to a 6, as it would be a small upgrade. You would likely want to upgrade from a 3, but the design is too old, the cameras are too small, and probably other problems. I think we need a very stable upgradable base.
But that's what I mean. In 3-4 years I don't want to upgrade my phone, but if I need to replace some broken parts, it would be nice to be able to upgrade them. I replaced my FP3 cameras at the time with the better ones in that exact scenario.
