When the OS causes a problem with some application, it's typically the job of the app developer to inform the OS developer of any issues that recent changes have caused. Along the lines of "this change you made over here has caused our software to change in behaviour like this". When you've got a definite set of applications (the PSP game library in this case) you'd like to think that the OS developer would use them as a backwards compatibility testing suite, but as the number of PSP games increases with time the task of checking each new OS version would become gargantuan, so they probably skip it entirely. They might check to see that the game still loads, but not likely too much beyond that.

The point being, SL are probably the only ones really qualified and outfitted to determine what the firmware updates have broken in Pure, and they're really busy right now!

At least, that's the way software development works on my side of the pond. There could definitely be some differences in how they do things over there. 8 )