I don't press my binding in half either. I did it once and thought well that is a big waste of time for what? I never thought about the inside curve but it makes sense. I don't sew my binding strips on the diagonal either. I do straight across joining. Can't tell a bit of difference on narrow binding. Lately I have been doing wide binding so I match up the fabric pattern strip joins, using sewing straight across binding. I rethink all the detail fussy work many say has to be done when it clearly doesn't make any difference.