What they're focussing on now is different. CPU is obviously almost good enough, battery is more important.
This... I want a longer battery, lighter weight, etc...
It is already fast enough and it will be awhile before apps catch up.
They will, but not for a few years, then we'll need another jump.
Yes, longer battery life would be nice but it's the bigger screen size and the fingerprint sensor that are motivating me to trade my iPhone 4S in for an iPhone 6+, I've decided that I want a phablet. It takes more effort to crack the fingerprint sensor than it takes to just sitting in your couch and punching in four digit pin-codes until you unlock the phone. I could put a password on my phone but punching in a password every time I get an e-mail is way too bothersome and I can't read Google maps in landscape mode on my iPhone 4S anymore because the display is just too small. As long as the device has adequate processing power to run the latest apps and games for the next 5 years and gets OS updates (which previous experience with Apple devices tells me it will) I don't really care that much about whether it has benchmarks and a processing speed that trumps those of the latest offering from Samsung, LG, HTC et al. In fact the majority of the features that I really value the most are software features ranging from the 'Continuity' OS X integration, 'HealthKit', App services and Universal Touch ID authorization for all apps to the little stuff you almost don't notice like, the revamped keyboard, built in phone calls over wifi, an overview over which app is using the most power, reply notification for especially important messages, ... the list goes on. Now if they'd only get around to putting a folding bookmarks menu in the little wizard you use when you add a bookmark in Mobile Safari... this is iOS version 8 for Christ's sake and Apple still hasn't gotten around to fixing it.