I mention this as a “note” in my reports for three reasons:
First, when a door mounted on the outside track is opened, the handle comes in contact with the fixed panel. My thumbnail is just now growing back from throwing open one of these doors and smashing my thumb between the handle and the fixed panel! Yeouch!
Secondly, most people like to cut a dowel or PVC pipe to fit in the slider track for cheap security, this is not possible when the slider is on the outside.
Thirdly, this is anecdotal, but I have noticed that the track does accumulate more dirt and debris on the outside and the sliders stick and catch more often, again, just an observation.
I don’t expect that anyone will demand a new door replacement from my mentioning it, but perhaps will use my damaged thumb as a cautionary tale to be more careful when opening the door!