its because of production yields, producing ps4 and ps4 pro will affect the production of PS5 due the limited number of assembly line and fabrication plants. and those thing can be easily added to ps4 pro slim and make it available at a much cheaper rate. also manufacturing legacy hardware does get expensive over time.. and not to mention those TV box gets hardware updates regularly, almost all of them have 4k features so having a Pro instead of Base model will be a sensible thing to do.

Should be resolved by 2020.

Shouldn't be a hindrance even with a different CPU ISA. Intel runs ARM code on it's x86 chips just fine thanks to binary translation.

Ironically... It's the Playstation 3 emulator that is farthest along in development. Clearly the Cell isn't being a catastrophic hindrance in that regard... Because despite it's relative complexity to extract as much performance from it, each core is actually relatively simple/stupid by modern standards.

GDDR6 on a 256bit bus is possible. You place two chips on a crossbar.
nVidia has actually done a similar thing before.

That is ignoring the fact that GDDR6 should have twice the density that GDDR5 had anyway.

You are ignoring the fact that most PC's have gigabytes of extra memory in their graphics processors.

The Xbox One X also throws Gigabytes at the OS. - Meaning there is significantly less than 12GB for actual games.

It wouldn't be irrational to assume like every other console generation that the OS/Background task footprint will likely grow next generation, meaning that there will be significantly less than 16GB in your hypothesis. - Is that truly enough for a next gen console? Is it really?

lmao "boring". It's not all about achieving graphical or technical advances. It's about da games, and this gen is getting more interesting with every year.

Lawl. You skipped the ONE must own console of this generation? Oh and FYI, the PS5 isn't coming out until at least 2021. The PS4 is selling way too well, and way too many great exclusives are in the pipe for Sony to just cut the gravy train short of it's potential. The PS4 is on track to sell 100 million units by 2020. The fact you don't own one is beyond me.....

Anyone that thinks Sony's PS5 RAM will exceed 16GB is nuts, it may even be 12GB. But it certainly won't exceed 16GB. 8 for games, and 8 for the OS is likely. The technology that will be in question, and what is likely being discussed at Sony's HQ right now - is the HDD space. We've all seen first hand that the One X has a clear hard drive space problem, and Sony probably doesn't want the same conundrum for the PS5. They'll either introduce a Cloud Storage service for a players' game library, or they'll mass produce officially licensed external HD's in various sizes (2, 4, 6, 8 TB) with the ability to use a pre-existing external HD that you own at launch. My guess? They'll probably introduce a cloud storage service, while slightly increasing PS Plus membership fees because of such.

It's all about the "games"... for you. I've been playing the same shit now for years. I need something new. The sheen is gone for me.

That means the Playstation 5 will have less Ram for games than the Xbox One X. - You didn't think this hypothesis out did you?

12GB is possible on a 192/384-bit memory bus.

However... The thing you aren't taking into account is that 2020 is still a few years away.
GDDR6 is still ramping up, it has increased density over GDDR5 and GDDR5X.

That means that the same amount of chips it would take to have 16GB of GDDR5, would give you 32GB of GDDR6.

Microsoft has made a small effort to rectify the lack-of-space issue by negating the requirement for localized audio to be installed/downloaded with various hooks in the software stacks. However not all developers have taken that up, which sucks.

Compression could also be improved, perhaps next gen there might be a dedicated hardware block on the SoC tasked for decompression duties?

Hard Drives are still getting bigger, 4 Terabytes is the same price as 2 Terabytes from just a couple years ago.
Cloud Storage can go get stuffed IMHO.

At the moment I have 9 Terabytes worth of storage on my Xbox One X, which is a good 60% full.

16GB is not even close to worthy of next gen. Even 32GB would be by far the smallest increase in memory in the history of Xbox and PlayStation consoles. 64GB would be absolute smallest anything labeled PS5 should house. 128GB would give us the standard increase gen over gen, that we have seen in every PlayStation successor to date. 

16GB, with Rzyen, and Vega would only offer us current gen games at 4K/30 to 60fps. That is not what next gen has ever been about. Next gen is about offering something that would be either impossible, or require major draw backs on prior consoles (ex. smaller levels, less enemies, online limitations). With a 16GB bottle neck, there would be nothing PS5 could do that PS4 could not do at lower resolution with lower textures. Better to call this type of system a PS4 Premium, and save the proper PS5 name for something that delivers truly next gen technology for devs to build games around.

That is why I say PS4 Premium in 2019, with PS5 in 2022. PS5 needs 64 - 128GB HBM or GDDR6, 4TB M.2 NVMe, 20+ TFLOP/s GPU, and 8 core/16 thread Ryzen. Those are the kind of specs that can offer a good baseline for a new console cycle. 16GB, 2TB HHD/SSHD, 10 - 12 TFLOP/s, and a 4 core/8 thread Ryzen, does not move the bar as a baseline for next gen game development.

Wow really. I thought 16gigs of ram on PC is more than enough. I am not sure so much amount of ram is required. TBH textures are way overrated. I think cpu and gpu are more important. cpu has been the worst part of PS4, PS4P. Pretty sure we will get 16gb at least of ram with higher bandwidth.

A PC with 16GB of Ram... Typically has more Ram than that.

I.E. Drop a GPU with it's own dedicated 8GB memory pool and suddenly by magic... Your system is running with  24GB total.
People need to start taking into account the memory in the entire system, not just the pieces they pick and choose.