Both of the things you listed could just as easily be interpreted as distinctive visual design elements. Ultimately, in
every sense, function, capability, and limitations guide visual design.
Look at the Made for iPhone badge [1]; the bezels of the older devices are prominently displayed; they + the home button are what enable someone to look at that picture and immediately know its an iPhone. How would that badge look if all they showed was a generic rectangle [2]?
Today, both the bezels and the home button are gone. Yet, take one look at this [3] and tell me it isn't just as distinctive.
Apple made the decision to rotate the camera apparatus on the back of the device by 90 degrees [4] relative to the original device. Is there a functional reason for this? Probably not. Its a visual choice; it differentiates the upper-end device as an almost status symbol. Think on that for a second; you want them to hide the cameras by making them flush, but they picked a completely opposite approach. They accentuated the cameras by making them a status symbol. Flush, hidden cameras could never do this.
Want to bet that the iPhone X won't be their best selling iPhone they've ever made? I doubt it. You know it will be.
Let's talk Pixel. Specifically, the glass part of the back [5]. Its there for a functional reason; improving radio connectivity by avoiding metal. But it could be much less distinctive and accomplish the same purpose. Apple did something similar by running less visible plastic trim around the device with the 6/6S/7/8. Pixel's way is a unique, differentiating design element.
You can try to make a perfectly functional device. No design elements, flush cameras, a beige rectangle. Perfectly functional. Now, you've lost something qualitative; distinction.
[1] https://support.apple.com/library/content/dam/edam/applecare...
[2] https://www.androidcentral.com/sites/androidcentral.com/file...
[3] http://www.telegraph.co.uk/content/dam/technology/2017/07/31...
[4] http://assets.hardwarezone.com/img/2017/09/DSC_1461.jpg
[5] https://www.theandroidsoul.com/wp-content/uploads/2017/08/go...