My guess is that since it's not the more popular trip that it absorbs a lot of the changes that are incorporated into the OWE even though they dont entirely make sense. For example, the two stopover limitation is probably a throwback to when the OWE also had such a limitation. I am sure that the drafters considered what would happen if they scrapped the limitations and envisioned a trip with 20 segments total and 15 stops in Asia or Africa so they decided not to change it when imposing the 20 segments. I do wish that the trip allowed 8 or 9 stops with a max of 3 per continent.