Unfortunately, the supply chain often goes 3 and 4 levels deep. And by the time you get to companies that far in the supply chain, (a) no one has ever heard of that company, so the trying to threaten them with reputational damage doesn't really work (it will be some random set of chinese characters for a company in Shenzhen, for example), and (b) it will turn out that the team that wrote the device driver for that particular subcomponent in the SOC was disbanded as soon as the part was released, and 4 years later, half are working for a different company, and half were died during the COVID pandemic.
Sure, if you could set the Wayback machine back in time, and require that device driver be upstreamed, with enough programming information so it's possible to maintain the device driver, maybe it would be possible to upgrade to a newer kernel that doesn't have eleven hundred zero-day vulnerabilities. But meanwhile, back in the real world, very often there's not a whole lot you can do. So this is why it's kind of sad when people insist on buying Nvidia video chips that have proprietary blobs because performance, or power consumption, or whatever, instead of the more boring alternative that doesn't have the same eye-bleeding performance, but which has an open source device driver. Our buying choices, and the product reviewers that only consider performance, or battery life, etc., drives the supply chain, and the products that we get. And this is why we can't have nice things.