Apple's philosophy is to find the size that satisfies the most amount of customers. The iPhone has gotten to the point that I think we all agree that it has to grow. No one is arguing that. But collectively, the masses don't want 5in+ devices. They want quality high end practical devices, which is why Apple products resonates so much with people aside from the ecosystem.
If Samsung wants to make a special device and call it a Galaxy Note, hey, more power to them and the people that but it! But the S4 should def be smaller. By it also being 5inches, it makes literally no sense in terms of differentiating it's product line.
Same goes for any OEM trying to make a nitch product. Your basic flagship needs to be manageable and popular to the collective audience, and then u make your phablet nitch product! That's just my philosophy! But I know I'm right!
And just like your example above, I too agree that 4.7 (Moto X style) is the sweet spot!
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