And yet... 28nm could still have been pushed farther.
The Xbox One X has 7~ Billion transistors... AMD's Fuji architecture has 9~ Billion at 28nm.
The base Xbox One and Playstation 4 had roughly 5~ Billion transistors at 28nm.

But you are right, the Playstation 4 Pro would have been a big chip... A chip that is impossible to manufacture at 28nm? Not even near it.

720P is HD.
1080P is Full HD or FHD.
1440P is Quad HD/2k.
2160P is Quad Full HD/4k.

I did. ;)

The thing with this console generation is that better technologies were already available when the consoles launched.

Agreed. Start off with the best hardware that you can have at the very start of the generation... Then release an iterative update later with the best hardware you can.

I have said it tons of time... If the technology doesn't exist on the PC in the mid-range, then it ain't happening on consoles.

Before the Playstation 4 Pro and Xbox One X launched it should have been common knowledge that 4k was not going to be achievable for either platforms as AMD just doesn't have a mid-range GPU that can reliably do it with decent details.

Next gen is still a few years away... And AMD has a couple of new GPU generations to go through, so that may change.

I think not hitting 1080P reliably on the Playstation 4 and Xbox One base consoles was obvious when the hardware was revealed... Despite people drooling over the 8Gb of GDDR5 Ram.
The GPU's those consoles were based on were struggling to reliably attain those resolutions with decent framerates... So it was a given that consoles which are derived from that exact same technology would have the same shortfalls.

Next gen though.. All bets are off.
I would be happy to assert that 1080P will be the lowest rendered resolution... Despite not knowing the exact hardware. - As low-end GPU's are getting surprisingly capable at handling 1080P and next-gen will be using GPU hardware orders-of-magnitude better than that.

No developer has ever optimized for all PC's. There is literally zero point. :P

mid gen upgrades is the best of both world, devolopers would half ass their games right from the start.

.... I don't think you understand how console optimization works, and how it literally does not occur at all on PC. Game developers do not optimize games for any hardware specifications on PCs, but make their games engines interface into much more bloated APIs instead. There's an entire layer of abstraction that does not exist in console programming that gives PC games their hardware compatibility.

They could do it, but will they?

Both models would need to have the same type of hardware, except for GPU performance and storage space/speed. The GPU would need to be the same model, just less CU's in the base model and much more in the Pro model. The Pro model could also use some extra RAM.
This should make scaling games for devs quite easy, so both consoles should be well supported from the start.
The Pro version would probably end up XB1 size, and would require a 300w-400w PSU, which is a lot, but doable.
The base PS5 can be dynamic 4k/60, while the Pro model must be true 4k/60 at all times.
$399 & $599, or $349 and $499. Above $500 at launch could defeat the purpose of a Pro model that early and only lead to the same level of sales PS4 Pro is getting now.
All PS5 games must work on both systems without one or the other feeling broken.
The gen may have to be reduced to 5 or 6 years overall, or have a mid gen upgrade again anyway after both.

I won't be buying PS4 Pro because I can't be bothered now that my PS4 is good enough. Had the Pro been available since launch, I would have gotten it after a year or two instead, when the price came down, and so would most of my friends. We won't upgrade once we make a choice each gen though. Is it better to make the spec hungry gamers wait 3 or 4 years?

I think solving problems like having proper full support for both models from the start due to a more equal user base, would far outweigh a large power hungry console. It's not like they won't shrink it after 2 or 3 years if you require that and would wait that long for a mid gen refresh anyway.

It's goal shifting because you assumed it done good without having any numbers... when putting that it does 1/4 of the other version you then declare that to be the MARKET wanting it because the expectations of the MAKERS were met... that isn't how it works.

Yes PS4Pro satisfied what Sony said to be their expectations, and had enough acceptance. But to say that is what the market wants, when it sells 75% less than the other option isn't really true.

On the point of the size of the ship. Yes it would be big in a single chip, but considering the "butterfly" type of PS4Pro, it would just be the same size of PS4 original, but a little less than twice the thickness.

About the PC, yes I know they don't optimize for PC. But changing the optimization from 2 to 4 platforms (when the change between then will be mostly pixel count, texture, etc... which is already happening right now) isn't really a big issue.

I do know a little... but please explain, and put how it would be impossible to achieve on 4 platforms instead of 2 (curiously we have that now with PS4Pro, X1X, PS4 and X1) even more when they are launched together, with specs that scales from one another and the focus of the change is IQ output.

Err... what games ran sup HD on PS4?

Also people want higher fidelity and they don't go to PC because PC doesn't have the games they want. 

I think there is a couple 900p games on PS4. But I don't remember the titles.

He said more than often.. 

I can only think of Ubisoft games and Battlefields.
http://uk.ign.com/wikis/xbox-one/PS4_vs._Xbox_One_Native_Resolutions_and_Framerates

Judging by this list I'm not sure how he got 'more than often' when it's more-so the rarity. 

Now I see what you were pointing... yes it wasn't even something we can easily remember happening.

But pointing very few games had a PS4Pro patch available is true to this day.

Sub HD is lower than 720p. I know XB1 has a couple 640P games which is what I thought he was referring to. So yeah you can see my confusion when he said more often than not PS4 games are lower than HD. Which is incorrect with both definitions of HD.