> It should be noted that Intel makes CPUs, while Qualcomm makes SoCs, which include much more than just a CPU. Usually supporting the CPU is the easiest part, the rest is the issue.

Here's a random 15 year old Intel PC (you can also do this on many current ones):

  $ lspci | grep -v Intel
  [no output]

Every piece of silicon in it is made by Intel and most of them, including the GPU, are integrated into the CPU. And it's all supported by current Linux kernels. The same is true for many AMD systems except that you'll usually see a third party network or storage controller which is itself still supported.

So no, it's a Qualcomm problem.

They update the roms while keeping everything provided by Qualcomm the same

so basically the kernel is frozen even if the android version is updated