A well documented processor, with a simple instruction set. There was also a big advantage emulating the processor: It was a very simple design. UltraHLE was neat but ran all of about 8 games. Also please remember the more tricks, the more problems. They make extensive use of HEL tricks, dynamic recompilation and so on. All the video processing is done by your GPU, and thus you do get things like better resolution than the PS2 and so on. You need a heavier hitting processor to do it, something like an i7. It is just too powerful, and too odd, of a system to emulate on the PS3. Emulator authors seem to be good at emulation but not so good at current coding practices. Generally speaking, emulation coding seems to lag behind regular coding. PCSX2, the PS2 emulator, does use two threads well but that is it. Emulators are largely single thread, with maybe a second thread for some video rendering. I don't know that it couldn't, but it doesn't. Also the Cell's power seems to be in parallel processing and that is something that emulation doesn't do much of. If it were easy to do, I'd have thought Sony would do it to increase compatibility and keep people happy.
Now maybe the Cell happens to be well designed for emulation the EE and VUs, but I kinda doubt it. You literally "virtualize" as in run most things natively, so you achieve high speeds. That's why PC on PC virtualization is so fast. Emulation incurs heavy overhead anyhow, but the more different the platforms, the harder it is. It doesn't even work all that great on high end modern PCs. The PS2 is a bitch to emulate because its processor and video processor are so strange. For all we know, at one point, all users who have ever installed a homebrew pkg (even if they update later) will have their consoles permanently banned from PSN. Plus, nobody really knows how Sony's software ecosystem works yet. How about we concentrate on getting that to work instead of illegally using Sony's OS and tools?
We already have a perfectly good port of Linux to the PS3, capable of replacing lv2 while gaining RSX/3D funcionality thanks to the new exploits. This can be fixed, but only if people care instead of going for the quick and dirty way. Instant satisfaction (using Sony's leaked tools instead of writing your own) only works in the short term. It will just end up like the Xbox1, whose homebrew scene was underground (except for linux-based stuff). Sony will be free to legally threaten any homebrew communities. This guarantees that PS3 homebrew is and always will be illegal, and therefore can never be legitimate in the grand scheme of things. Nope, I'm sure Sony's upper management is thrilled to see that homebrew is being created using their leaked SDK.
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