We disagree on some things, and I agree with Radon87000 on some things, but I agree with you here, Lagwagon.
Overall Apple puts a decent balance of hardware upgrades into each iteration, and there are arguments to be made for things they delay on (except maybe ram and base storage).
That said, my personal preference going forwards would be a resolution bump to the 4.7". The 6+ resolution in my mind strikes the right balance for sharpness vs performance/battery (except I wish UI rendered at the native panel resolution).
You can get by with 326 ppi for sure, but to my eye, there is still perceivable added visual appeal in the higher res panels, that to me is at least as valuable an improvement to overall experience as the rumoured shaving of half a mm from an already very thin body.
To me, the "perfect" scenario would be if they shifted the 2x retina scaling to 3x, and all panels were native to that multiplier (unlike the 6+). That's my "dream"