I'll give you an example from bodybuilding products.
Recently BSN came under fire for their preigniter products due to the excessive amount of magnesium, and sodium which are cheap chemicals used to make the contents appear larger than actual.
The actual pump ingredients are minimal when you compare labels. 10-20x the amount of useless chemicals, and 10% of the ones that actually are involved in nitric oxide pumping.
They changed to a new formula (which still isn't that good) and wrapped it in all new packaging and advertised new improved formula which curiously enough, spiked sales.

1 They don't gain anything, but they don't lose anything either. I can tell you didn't read the OP because I already addressed this.
2 Well, we can just look at the sales when slim version were released of consoles.

I mean, the facts disagree with you, pretty much unanimously.

Designed for Americans (you can remember us as the gas guzzler SUV/truck race).  Bigger is better is the usual saying (well at least in the state I know reside in, Texas).  They are just catering to their main consumers which is N.A. and U.K. 

Die shrink is only coincidentally occuring at the same time.
The future xb1 slim will be to make money, the ps3 and 360 were to save money. Change your viewpoint, and it'll become clear.

If bigger really were better, I could best the X1's power with a Beowulf cluster of Raspberry Pi's. At $25 a pop, that's 16, and it might be more powerful, to boot.

sounds delicious!

You didn't ask me to prove anything if I racall .

Again, I agree larger fans are quieter because they displace more air at a lower RPM.  But this is only part of the equation.

1) If you cover up most of your PC's vents then internal temperature will rise, temperature differential between heat sync and air drops, and the fan will need to operate at RPM to get the same cooling.  This should be obvious heat dissipation physics.
2) Smaller vents require higher pressure (so higher RPM) to achieve the same air flow.  This is also obvious physics.  In layman's terms it's the difference between breathing through your mouth and breathing through a straw.  It takes much higher pressure to breathe at the same speed.  PC form factors usually have plenty of ventilation so this is a small issue.  Xbox one has ventilation on the top surface and sides, while PS4 mostly on the back.  It has a bigger mouth, so to speak.
3) XB1's vents all over the top and sides give it more space to dissipate heat around it, so it fares better in an enclosure.  Again what I was mentioning is my XB1 is happy in my cabinet all the time, but PS4 is not at all.  PS4 runs much more quietly outside with clear space around it's rear vents.
4) When PS4 gets hot the air blows so fast that you can hear the sound of the air blowing.  Again, this is related to pressure.  It's not just directed away from you.

Well no duh, all slim models are released to make more money and those final redesigns for the 360 and PS3 where also done to make money even though they where pretty unnecessary.

http://youtu.be/i_r3z1jYHAc

lol 33 of them...hehehe

or

64 of them

"I'd have to see some proof of that." xD
1) yeah but I don't know what you're even referring to. You make an metaphor of something that doesn't even apply?
2) ACtually, higher rpm isn't needed to produce the same airflow, physics dictate that the same amount of force through a smaller opening would create more air pressure. You're near to your point, but you're off in saying it takes "more air pressure to breathe at the same speed". That's not true. Air pressure is air pressure. There doesn't need to be another force at all. Just, like, a balloon. But yeah, it has a bigger mouth. However, again, that doesn't relate at all to the open space within the console, that's just about the vents. I completely agree that more vents helps airflow and air pressure, but you said that more space meant quieter.
3) That is because ps4 is meant to have a vented area behind it, and below, for example, against the wall on a shelf where it pushes the air down and behind, which follows exactly with the cords. If you have a ps4 in a media center, then that air is going to push around the base and back and run hotter because the airflow hits the same spot repeatedly, which increases cumulative heat.

Again, this doesn't relate to quieter.
I'll say again that a smaller fan has to run at a higher rpm than a larger fan. This creates "whine". This makes the ps4 fan louder. Nothing to do with vents or internal space. Furthermore, ps4 runs hotter just on basis of having higher clockspeed.

Just read your edit.
Again, yes that's true. However, it doesn't relate at all to the point I originally argued. This is called a strawman. I argued an earlier point and you've changed it into a new point and are arguing this other point that I've not disagreed with. I don't want to argue about air pressure from the vents, and I never have and never did. I agree that more vents are better.