It is just to get newer versions of the proprietary drivers faster, and to have a more similar environment as developers. (Like if a feature of the driver is dependent on a new API just added to nearly most recent kernel)
Kernel updates can bring better support for different hardware which as well can influence how well the GPU drivers work, like, improving them.
πbut nice to hear that it works on your machine well πͺπ»πͺπ»πͺπ»