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Pemalite said:

Well. Sony doesn't have the software engineering resources that Microsoft has for starters.
Not saying they couldn't do it, but it would certainly be more difficult for Sony to do.

Even if Sony had the same resources like Microsoft did they still probably couldn't get the same results because there's far more architectural asymmetry between the PS3/PS4 than there is with the One/360 ... (3 ISA's vs 2 ISA's, local memory storage/DMA controller, non-coherent cache, it was just one insanity after another) 

People thought PS3 hardware was wild but wait till they see PS2 hardware ... (mipmapping on PS2 resembles nothing like contemporary or modern hardware)

The tons of non-trivialities baked in PS3 hardware compared to the 360 made binary patching not worth it but the final nail in the coffin was performance and patent issues abound ... (although I'd be interested to see how PS4 BC with 360 would've turned out) 

Pemalite said:

Unfortunately porting isn't possible in every scenario as source code can be lost.
It's actually been a common issue with remasters, Homeworld Cataclysm being a prime example.

Sure the source code can be lost but as long as you have the copyright license to the original works then you can just simply dump the contents and reverse engineer the compiled code from the retail versions of the games like Square Enix did when they were porting Kingdom Hearts to newer Playstation systems according to digital foundry but Microsoft's solution isn't foolproof to this issue either unlike pure emulation since they require the source code too ... (Microsoft first tries to recompile the code for x86 then goes on and collects the GPU shaders for the games then translates those too sort of like GLSL to SPIR-V)

Still in the case with Sony, it's a better idea to go through that extra work than to achieve BC the same way like Microsoft did by patching binaries with very little hope of AAA games running well on their system ... 

It's also more worthwhile than ever to remaster/port games since upgraded mid gen console SKUs have enough CPU headroom to run every last gen AAA game at 60FPS ...  

People don't really care about how older content is delivered, all they care about is whether or not they can access it ...