you are quite mistaken about hair color change vs body size and shape.....
if a character has red hair vs blue you dont have to position them differently in the scene ie when they are sitting down/having sex which can go even further because not only would the positions be different but so would the sex itself (visually if nothing else) so that would require rendering multiple different animations not just a small change
you also ignore the fact that "fat vs fit" is not the only branch and since "fat vs fit" is so ingrained deep into the story every single other branch needs to have differences for "fat vs fit". and if the "fat vs fit" does not make a difference at all why even add it in the first place?
Edit: from what ive read we are only just a day in? We will see any body changes way faster than they should happen so I dont really know why you bring up that point
The person's height / limb length doesn't change in a fatter version. Sure, some poses may need a slight adjustment, but many will line up right just automatically or very close to just right. Any extra posing is just a minor tweek to the scene being rendered. There is a lot of extra rendering though.
They may make entirely different scenes for fit vs fat. That would come with a lot of extra posing.
I don't think they are gonna add a massive amount of muscle or fat. It will probably just be slightly more tone / thin vs how she is now.
It's not like Paula is a great big fat person right now. She is just a little curvy. She is thick.
If it is to be realistic I don't see noticeable weight changes coming in week 1.
Losing just 5 pounds (approximately 2.3 kilograms) in a week is considered a significantly rapid rate of weight loss and may not be sustainable or healthy for most individuals in the long term. Losing weight at this rate could potentially lead to several health issues.
Even gigantic fat people are only supposed to lose like 2-3 lbs a week. Much more than that is dangerous.
I have taken shits that weigh more than that lol