SW, having played a good many guitars over the years , and especially having them strapped across my shoulder for prolonged periods (gigs) ... some are just more comfortable than others ... Standing and playing , the overall Weight and
Balance become the main factors , as long as there's no sharp points to dig in your belly, ribs. or nether regions ..

Sitting is another story ... sorta' has to fit the human body and not be based on a fashionable design element based on musical instruments of two centuries ago ...

Plus , everybody likes to play the guitar , seated, at a different angle ... problem with most guitars is they only "sit" one way ... With the new one I can use the back notch to hold it much as one would hold a flying V, neck high ... The center notch over the right leg aligns the guitar/neck at more of a 45 deg, angle , presenting a more typical (and comfortable) playing position...
The front notch , or "waist" , presents the guitar on a more flat position for those that prefer to play that way , much the same as a long strap position (standing) with the guitar slung low on the body ...
I'll try to get some pics of the various positions , once it gets finished (hopefully today ) ...