7 to 8 easily. Chassis design still followed the 6 design philosophy and didn't bring anything really needed( CPU power in the case of 3GS) or neat features( like 5S bringing touch ID). Probably 6 to 6S being in 2nd hindsight wise considering 3D touch was a flop.
You're missing a few options, including from iPhone X to Xs. I did that. And it was certainly the least exciting upgrade ever to me. Not that I'm sorry for doing it anyway, but still... compared to all prior upgrades it just wasn't a competition anymore. xD
Well, you know what the thing is with these 'smaller' upgrades? They allow Apple more time to do more with the 'new generation' iPhones. At the same time, these incremental updates usually fix problems with their predecessor.I agree with both of you. I hope this isn’t becoming a norm but if people are buying, they will keep doing the bare minimum while cost cutting wherever possible.