This is how high the guitar is...a bit higher than i said at first because i just took a quick look.
I bet you can't reach the 19th fret A string on that height on 5 string sweeps with your pinky...
Atleast for myself, I have to have the guitar on pretty same height, when I'm playing sitting.. I wouldn't be able to reach 19th fret A string with pinky comfortably on that height, without bending my wrist "up".
...and as my pinky is somehow way too small, compared to my other fingers + it bends a bit differently than the other fingers..
Ahh well, that's it.