It makes sense to use the left hand as phone holder to be free to use the right hand to do some other activity, example: I will have my breakfast while reading HN.
However I usually keep my phone with my right hand and scroll with my right thumb. Furthermore I am writing this comment by swiping with my right thumb. I can swipe with my left thumb but I'm not as accurate.
However I usually keep my phone with my right hand and scroll with my right thumb. Furthermore I am writing this comment by swiping with my right thumb. I can swipe with my left thumb but I'm not as accurate.