You can support that kernel version, like distributions do now with back port etc work, or you can prefer SoC vendors that promise updated driver support. If the latter was happening, the problem would be fixed by now. So essentially phone vendors have been voting with their dollars for lack of driver updates.

But even for the self caused major version jam, the "get 2 years of support from upstream" is a heavy understatement and even after the n years of community LTS support ends, it's just the baseline you get for granted and you can diy more.