I do the same thing when switching between and any Android phone. I am constantly hitting the back button. Then remember there isn't one or it is way up at the top of the left hand side of the screen. Not a good implementation if you ask me. Having it at the bottom where your fingers/thumbs are naturally is the better solution imho.
I can't disagree with the familiarity a longtime Android user has reaching for the back button--I do the same with iOS swipes. However after using a Nexus 6P lately, I will disagree with your later statement, at least for how I find myself typically holding/using the phone. In most cases, my thumb tends to hover around the middle of the phone when using it. The distance to either side for a swipe back/forward is much shorter than the reach to the bottom corner for the back button. I was surprised how when using my phone in my right hand that reaching for the lower left back button is even a bit of a strain and usually required me to reposition the phone in my hand. Using the phone left handed made reaching the back button even more awkward. I'm sure part of this is the fact that the Nexus 6P is a damn big phone and it's less of an issue on a smaller/narrower phone like the S7/S7e but regardless of phone size, the ability to swipe from anywhere on the side makes it a more comfortable gesture because it's almost always a closer reach. The problem of course is the lack of ubiquity of the swipe back/forward gesture across all apps.
The other issue I'm having with the back button is the inconsistent behavior that
@nj-morris mentioned:
My problem with the back button is that it's too general. If you follow a link onto a tweet for example, and it takes you to the Twitter app, blessing the back button will take you back to the Twitter main page instead of the app you want. On iOS, you have the home button, the side swipe, the downward swipe, and the corner button, and each do their own. That's why I prefer the iOS solution.
I've navigated to another app via a link and pressing the back button with behave as mentioned above and ultimately back to the home screen, while I could swear in other situations it will navigate back to the previous app.
While the location of the button is less than ideal on iOS (top left corner), if I navigate to another app from within an app, I can
always get back with the top left corner button or 3D Touch gesture.
There's no doubt the back button presently trumps the
inconsistency often found in iOS apps (maybe swipe works or maybe it doesn't, back button could be in any number of locations on the app, etc) but if the swipe forward/back could be implemented across the entire OS and apps on iOS, it's a better solution, IMHO.
There's an explanation for that but I forget the exact details. It had something to do with the progression of order. If you go to a link via a certain app, the back button will take you back to that app because it considers the user is still using the previous app. You've just visited something that the app can't display (like a link because Twitter isn't a browser). But it still treats you as still being in the Twitter app. Because you didn't actually app-switch via the app switcher or launch the browser app directly. You only went there via Twitter and it still thinks you want to continue using Twitter after you visit link.
I'm butchering the explanation. Sorry. But it's something like that. Just FYI.
Thanks for that but is the user supposed to be cognizant of these differences as they occur and then adjust their subsequent actions accordingly? "In this situation I can press the back button but in this case I need to press the task switching button..." This is just as bad as not knowing if a swipe gesture will work on iOS.