I think the annual leaps are much bigger now than then. Steve Jobs may have made it feel like they were bigger leaps. Also, then as now some of major new features were software.I think this stems from those of us who started out from the early days buying every new iPhone because it felt like we were seeing these big leaps every other year. Now that the market is so mature the only thing in recent years that has actually been an interesting development is the folding phone market.
2007 iPhone – Revolutionary.
2008 iPhone 3G – 3G. App Store and MobileMe. New design.
2009 iPhone 3GS – Faster but not much else.
2010 iPhone 4 – New design. Apple chip. Antennagate.
2011 iPhone 4S – Siri and iCloud
2012 iPhone 5 – New Size
2013 iPhone 5S and 5C – Two models. Touch ID on the 5S
2014 iPhone 6 – Large display. Two flagship models. ApplePay
I purposely wrote this from memory and not research. This whole debate may come down to Apple increasing the version number instead of adding an S to the same number every other year.
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