Umm. I obviously mean handicapped wherein the individual needs tactile sensation to be able to accurately use said feature. See, when you have a perfectly flush piece of glass with no tactile button location as in the rumored new iPhone, that presents major accessibility issues.
This button would not at all act as the Home Button. The Home Button is at the bottom face of the device, where it always has been, and always will be. This is called an accessibility feature. Categorically different. And I'm not saying the button is for only accessibility either.
What I can tell you is that in leaked schematics of the case, which is where we get the elongated power button in the first place, there are two points of contact. Not one.
Let's see:
1) Finding + pressing rocker switch with a surface area of less than 0.1 sq inch (which requires pinching the phone with one hand or using both hands).
or
2) Double tapping or Force Touching anywhere on a piece of glass with an area of nearly 13 sq inches.
I'm interested to know what kind of handicap requires a tactile response that a rocker button can provide but the Taptic Engine is unable to. And for this type of disability, what proportion of population it represents.
I'm ignoring the fact that the OLED iPhone is expected to have cameras that can do facial recognition - which likely means it can recognize gestures.