I think it has more to do with the number of people and the size of graphic driver which are the biggest driver in the kernel (and not everythings is in the kernel). To me it's more like opensource is around 30 peoples accross all hw & core mesa while each closed source driver are likely done by way more than 300 people working full time.
Originally Posted by RealNC
By the way the closed source driver on linux use the linux driver model (or maybe i am missing what you mean by the driver model).
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