***Why do you think that PS3 can't be supported?***

Because the CPU isn't powerful enough to simulate the cell architecture as needed. They would need a top of the line CPU still to do that. Emulation on PC of PS3 games are still extremely buggy and have massive framerate issues after years of working on it.

*** They can do PS1/2/3 through emulation.***

But they won't.

***I still believe that full platform support might be targeted even if it won't be ready for launch. ***

I don't.

***Having Playstations back catalog playable on one console would be an additional selling point.***

I don't think Sony thinks it that important in comparison to the amount of effort it would take to make it happen. Maybe the next generation or the generation after that? But, I believe we will likely see more pay-to-own emulated games much like those on the PS4/PS3. And, I also believe that the lackluster sale of those titles that exist is why they haven't moved forward with more emulation.

Sony has already ported some of their major PS3 titles to the PS4, and they might port more over time, but I highly doubt they are looking to do PS3 emulation at this time due to how much work it would take and the CPU isn't capable of supporting it.

***PS Now is not an attractive alternative in my opinion.***

PSNow is a functioning alternative that doesn't require game-by-game emulation. The cell architecture involves managing memory vastly different than anything else Sony has put out. It is a mountain of itself to get that to work, let alone that each game manages that memory differently.

I don't see how you can say that the CPU is not powerful enough when we've seen PS3 emulation work with comparable CPU power on PC. RPCS3 is developed by outside programmers having to reverse engineer the PS3 architecture on a fairly tight budget. Sony has first hand knowledge of both the PS3 and PS5 architectures.

While the PS5 CPU is clocked lower than comparable desktop counterparts, Sony could easily minimize the CPU overhead of the OS in PS3-bc mode. They might be able to clock the CPU higher using their smartshift implementation, since PS3 emulation won't be as GPU intensive (So far they've only talked about shifting CPU power to the GPU though). There is also an advantage of having standardized hardware across the board, which would make low level optimization much easier.

The R&D cost for a software based solution would be fairly minimal, but if Sony decided on pursuing full compatibility early on, some hardware customizations to make the process more efficient could be a financially viable option as well. Here are some factors why I believe that aiming for full compatibility is worth it from a business perspective:

-Compatibility with Playstation's back catalog is a selling point.
-Sequels could see a small increase in sale numbers when people have an easy way to catch up on the previous games.
-Being able to keep selling old games as an additional source of revenue.
-Perhaps most importantly: PS Now servers currently require custom PS3 silicon. A working PS3 emulator would make that unnecessary and save money in the long run.

These declines are on the back of extra revenue received from releasing games like Forza horizon 5 on PlayStation. So I’m being sarcastic here when I said they should go back to exclusives. Killing off a revenue stream from Ps5 sales will only make things worse

Its like the final episode of the Sapranos. You gonna go to make a comment and when you click add th-

Timezone thing maybe.... RIP