Almost no laptops are "made for Linux". For example, the last time I looked, System76 just sold rebranded Clevo laptops. So while you might be able to make the argument that System76 does more Linux testing than the likes of HP or Dell, trying to make the claim that System76's laptops are "made for Linux" is incorrect. I'm pretty sure that Clevo's are made for Windows.
They do the same thing you or I do before ordering a laptop we intend to throw Linux on: do some research first to find one that is mostly compatible, and then tweak the hell out of it until it mostly works. They just take the extra step of then selling the laptop. However, I can tell you from personal experience that System76 Linux laptops are far from perfect Linux experiences.