[toast0]

If the chipset vendors never provide fixes except to customers that ask, and the customers never ask because it costs reimbursed money to do something with them, from the point of view of the end consumer, the chipset vendors haven't provided the fixes.

In PC hardware, the expectation is that most drivers are available both from the manufacturer of the device, and directly from the chipset vendors. Some chipset vendors don't play that way, but most do. In mobile, the expectation is that drivers only come from the device manufacturer and if there's no updates, it's hard to figure out who's at fault because there's no transparency.