Unfortunately that’s moistly on maufacters. If they don’t release the kernel LOS can’t do anything. Also depending on the phone it might take a while till someone picks the phone and decides to support it. Laptops do have compatibility options. But I get what your saying, it is annoying but what did you expect from such organization?
That’s one downside of public infrastructure. The government can only allocate a certain budget. There’s a similar situation where I live but it’s about a school.