Did you read the article or lacking in understanding the text, or am I? I'll try my shot.
On Linux there is no need to maintain any Kloc for isc driver, if the initial driver development is done the "Linux community way", ie. shared, until the hardware will get revisions, which may need new bits and pieces added in by the vendor development team.
To put it another way with over simplification and has a familiar sound. Write once and forget. ;-)