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).