So that's all you've got? A fingerprint scanner? Other phones, such as the Note and Galaxy S, both show that a fingerprint scanner does not require the bezels to be huge. Furthermore, there is only a fingerprint scanner in the bottom bezel.
And as I've pointed out (and pretty much every tech publication, online or print, as well as endless first hand accounts have as well), those implementations are inferior. Some of the staunches advocates of the Note 4 here on this very forum will tell use themselves that their own experiences support these claims. So sure, they may be smaller but if they don't work easily and reliably, what's the point?
As far as the 'only the bottom bezel' argument, it's called design symmetry genius. The vast majority of phones use it, including your Nexus 6, the LG G3, and both Samsung devices you mentioned. Heck, Samsung even fills the empty space on their top bezel with their name. What's their excuse for not minimizing even further? Because it looks uneven and aesthetically unpleasant.
In the meantime, it only has one physical button, whereas phones such as the Note and Galaxy S, have a physical button AND capacitive buttons surrounding it, and still manage to have a smaller bottom bezel.
OK, now who's using obfuscation for their argument? You think Samsung is employing some engineering wizardry placing 2 capacitive buttons in what would otherwise be empty spaces on either side of their home button? Those capacitive buttons aren't the limiting factor of how small the bezel can be, it's the home button. Adding or removing them wouldn't change how big the bezel is.
The Nexus 6 fits an whole half inch of screen, AND stereo speakers in much the same size... Are you really going to try to assert that a fingerprint scanner takes up as much room as a half inch of screen AND stereo speakers? You and I both know that wouldn't be a sound argument, so please, let's stop with the fingerprint scanner excuse. It's a poor and archaic design, simple as that.
Well, I admittedly don't own a Nexus 6 (yet, it's on my Christmas wish list) so I cannot perform exact measurements, nor compare the 2 devices side-by-side but a simple visual comparison of photos of the two devices shows that the portion of the display dedicated to the soft keys and remaining bottom bezel appear to take up roughly the same amount of space as the bottom bezel on the iPhone 6+, a bezel with about a mm of clearance on either side of that fingerprint scanner. So yeah, it apparently does take up the same amount of space.
We can argue the merits of each devices hardware and features all day but it doesn't change the fact that the iPhone appears to be designed to accommodate the fingerprint scanner. You prefer the smaller bezels and stereo speakers. I'd like the dual speakers as well but I use the fingerprint scanner far more than the speaker so if I had to pick only one, I'll take the scanner. You're not the first to criticize the device's bezels and certainly won't be the last. You're also not an engineer at Apple with an intimate understanding of what's required to make the device function at its best, nor offering any viable solutions to your perceive problem with the device. So unless you can prove my last statement inaccurate, how about you keep the smartphone design and engineering to people who have a clue.
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