I assume all of these gaming laptops are largely developed by outsourced sweatshops today so I don't imagine much difference.

The firmware is amalgamated from a bunch of vendors with core solution coming from few common ones.

Sometimes you get hilarious errors, like Intel not having any way to verify if their driver is actually loading a dumped memory image (intel rapid start), so if you forgot to disable Rapid Start and installed anything on a drive in the bay that was specified for rapid start, on boot the intel driver would just... blit it into RAM and be happy dumb