Since the PS3 ran on modified OpenBSD, would it be possible to run physical disc games trough a disc drive on a Linux laptop by downloading the needed libraries? In what way would I need to modify the games/system?
Would the architecture play a big role? My thinkpad barely runs RPCS3 but can handle AAA steam titles.
This is not apples to apples whatsoever. Following this logic I can run ARM programs natively on x86 hardware thanks to android using the Linux kernel in its development.
You will need a compatibility layer regardless for different hardware architectures from your own. This includes the PS3’s CELL based hardware (which is why RPCS3 needs so much power to emulate the system at good speeds). Now if you ran Linux on your PS3, there is a possibility to do this (but then you’d have to emulate x86 games on your PS3).
It’s a little better with ARM to x86 since we have fast user mode emulators now such as FEX. Of course it’s not really “native” but good enough for the Steam Frame for example.
Of course, and I’m not knocking the FEX project. I’m just pointing out that there is no native solution to running programs built for other hardware architectures (other than a port adapted from source).
The PS3’s CELL is just so egregiously unique that it has a massive emulation overhead compared to ARM or any other more common/simple hardware architecture - less understood overall, and less understood in how it can be translated to x86 compared to ARM->x86.