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ITT: A whole bunch of people who do not have the slightest clue how insanely difficult it would be to emulate a 9-core PPC based arcitecture that is unlike that of any other mainstream processor on the market of an x86 based CPU. You're acting as if it's something that's either really trivial, or something that could be done effectively if Sony put some time and effort into it.

You could not possibly be more wrong. Emulating the PS3 hardware on the PS4 is more than likely impossible. Literally - impossible. Typically the way most emulators get around this type of challenge is by trying to emulate the timing and instruction processing order on a processor that is so many magnitudes faster than what it is trying to emulate that all possible bottlenecks become negligible since every operation is completed well before it would have on the original processor, and it can simply hold each process back until the proper timing is achieved. The PS4 is not nearly powerful enough to overcome such bottlenecks. In fact don't be surprised if its well over a decade before a PC is able to emulate a PS3 reasonably well.

The xbox 360 processor is a much simpler, far more well known, and far more similar to the x86 architecture of the X1 that it is far and beyond magnitudes easier to emulate than it would be for the PS4 to emulate the PS3. So please spare everyone the Sony hate. Sony absolutely, 100% is not holding back any efforts in backwards compatibility to sell things like PS Now. It's in fact the opposite. They created services like PS Now to try and make up for the fact that PS3 backwards compatibility was quite obviously never going to happen.