I have accidentally swipe-navigated far more times than I have ever purposefully swipe-navigated (zero times), so I am astounded to see someone who hasn't rage-disabled that misfeature upon installation of the OS.
reaching is muscle memory for me. buttons i like because i know what i'm getting, and what i'm getting can be many different things as buttons allow.
I basically only swipe back. This aligns web pages with iOS nav stacks.