I also feel it's not that hard to reach or find, but it's not a "natural position".After having used the phone for the last three hours straight I've come to the conclusion that the people complaining about the fingerprint scanner position have tiny hands or are extremely uncoordinated.
A natural position as in one in which you hold the phone normally as if you are using it. Doesn't require you to change the way you hold the phone.
I personally don't use it for fear of a slip while changing position if I was walking or something. Instead, I turned on the option for it to scan iris immediately when screen turns on. I do not have to swipe up first.
It is rather quick.