I'm currently working on the Platinum in Peace Walker after finishing up 4's, currently at that very annoying end game stage where all unlocks are stuck behind vehicle battles, including the equipment that actually makes them easier in the first...
They've found references to SaveMGO in the MC versions code, so there's absolutely some stuff they didn't have anymore and were only able to get due to the preservation efforts of fans.
You can keep trying to belittle the Devs efforts but it...
I feel you're missing the point of the emulation, it's an example of how deeply ingrained in to the PS3's OS the game is, not an exact comparison of the work. They had to make the emulator significantly more accurate just for MGS4 and even then...
A bunch of stuff would have had to be remade from the ground up, the game didn't even have it's own save system, it just used the PS3's own internal save system, so it couldn't save without access to the PS3's OS.
There's stuff like this all...