I mean, just because it's one of two GPU producers, that doesn't mean the nvidia product line is simple. There are desktop chips, there are notebook chips, there are multiple versions of the same card made by different manufacturers who add their own little touches, there are different chipsets, there are different configurations, there are different X11 setups, there are different desktop environments which may enforce different settings, etc.

It's not as simple as "one of the two most widespread GPU producers in the market".