There is some truth in that -- if x86 can achieve the same battery life and heat management as Apple silicon, barely anyone would care about ARM for Windows/Lin

There is some truth in that -- if x86 can achieve the same battery life and heat management as Apple silicon, barely anyone would care about ARM for Windows/Linux. AMD has made leaps in CPU efficiency in recent years, but that was still not enough. Your uncle probably couldn't understand or care about x86 or ARM. They want a performant, fanless laptop with long battery life, and it seems that such a (mainstream) laptop still does not exist in the Windows world.