You already asked and I already answered, post 127
But you are aware you made a mistake in that post? I thought this was explained by other posters - the points you made have little to do with thickness in practical sense.
A more powerful CPU does not require a bigger body because the MBP already used the most powerful CPU at the time and the newer one (Kaby Lake) does not need more space to operate. As for the throttling - again, you don't need a thicker laptop for any benefit. The new MBP already throttles less than any previous MBP (and the Kaby Lake is even more efficient) and equally to competing laptops, so - no - there would be no tangible benefit. As CPUs get more efficient, laptops are getting thinner.
As for the GPU - the 1060 or 1070 wouldn't fit even in the 2015 model. So, only if they made it, like, 2011 thick. No one wants that weight in 2017, right? If you do, fine, but Apple was never in this camp. But ok, this is the closest to reality of all the posts. Still, it's more of a business decision - if Nvidia had a deal with Apple, they would make a 1050 that could fit in the new design.
More RAM - also, as others explained, more RAM has exactly NOTHING to do with thickness. The only way to get 32Gb is by using a non-LP RAM. This would give a bad battery life even if they did put a 100mAh battery inside, as you can see with any Dell XPS equipped with 32Gb. Again, Apple may decide to offer 32Gb and sacrifice battery life or just wait a year more for low-powered 32Gb RAM. Either way, it has nothing to do with thickness.
Finally - a bigger battery. Well, the reports say that Apple will be able to put a 100mAh battery in the new design if they want to. That would increase the weight. Again, they can opt to do so, and again - this does not require a thicker body. And putting anything over 100mAh is not possible because of flight regulations, and no laptop manufacturer, as far as I know, does that.
So - a thicker body would:
NOT offer a better CPU as you can put the most powerful one in the new design.
NOT offer a better GPU by itself.
NOT offer more RAM - as others have explained, RAM has nothing to do with thickness.
NOT offer a better battery, as you can put a 100mAh battery in this new design, however, at the cost of weight.
So, basically, there are no real downsides to this thinner design, unless you want to return to 2011 sizes for the GPU. And you don't really expect Apple to do that?
Look, you don't have to like the new MBP. All I'm saying is - the Mac Pro situation and the MBP situation are not even close. This new design is, more or less, the same when it comes to power and efficiency, as the one used in the past 5 years. And in these 5 years, the MacBook Pros were a tremendous success - so why would you think it's the same case as with the MBP that was cool but kinda flawed from the beginning?