Moving to a normal chair toilet from a squat toilet (https://en.wikipedia.org/wiki/Squat_toilet) was a hell for me. Chair toilets just don't feel right and comfortable to poop from if one has used a squat toilet all their life. Squatty potty hits a nice middle ground because:
1. It is better than the chair toilet in terms of comfort of bowel movement.
2. It is better than the squat toilet in terms of the extreme stress on the knees