Games on the ps3 and 360 rarely rum on native 1080p because developers need to use the hardware resources, mainly the ram, for other stuff such as anti-aliasing(a very weak form of one) and other technical stuff I'm not too familiar with, maybe more advance shaders, more particles and lightning. If the systems were more powerful I'm guessing they would make a 1080p option for it but the price of the hardware would be more expensive.
...Tweaking a game to run at a higher resolution isn't "forcful" at all. It's a very, very simple procedure
It doesn't matter if it's simple. The fact is that you have to literally force the resolution. If you're tweaking a game to run at a resolution it wouldn't run normally, then you're forcing that game to run at that resolution.
Goodbye Chewy. You were the best friend I could ask for. Rest in peace, buddy.