This is silly. "It matches a 70 year old's muscle memory" should not be the sole test of good design; if it were, then we would be plugging mouses and keyboards into our phones.

As we more and more mandate smartphones to live, we need to take accessibility into account. Watching "the olds" (which we are all fated to become someday unless something intervenes) fight technology is eye-opening; especially when you realize that you are starting to fight it.

I never knew there was a virtual home button available in iOS; but apparently there is.