The real reason why Samsung, HTC and the other Android phone assemblers have “decided” to offer ergonomically inferior large screen devices is simply because they need more room in the device’s shell to fit all of their off-shelf parts and enough battery to run the inferior hardware and Android OS. Often Android handsets fail to make it through the day, even with all of that extra battery volume packed into plate-shaped devices.
Unlike Apple’s iOS, which is created expressly for Apple’s custom hardware – A6, batteries, Retina display, etc. – Android’s UI rendering happens in the main thread of an app and Android’s UI rendering has normal priority, rather than given higher processing priority as in iOS. This is likely because Android began life at Google as a BlackBerry knockoff and quickly had a touch UI bolted on right after they saw Steve Jobs pull the iPhone out of his jeans’ pocket.
The Android handset assemblers and those who settle for inferior wares routinely tout giant screens as a “feature / advantage” over iPhones, but it is in fact nothing more than a cover to provide greater volume inside the shell due to their inability to custom micro-engineer anything close to what Apple can achieve.
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