Go to a developing country and see the share of PCs that are running Windows XP and you will realize that things aren't that simple. The majority of the world doesn't care about OS updates, and they are definitely not spending money on it. They simply want stuff to continue to work exactly as it did when they bought it. Mobile phones already get updated at a much higher rate than PCs. The vast majority of PCs in the world stay on the version that the manufacturer installed throughout their lifetime.
And say in your example Samsung does get its shit together and spends a ton of money to upgrade every phone in the world...that's still ~25-30% of the Android population. What about the rest?
The situation is understandable for budget phones sold in developing countries, but that's almost entirely irrelevant to what companies like Samsung and Google do for their flagship products.
And say in your example Samsung does get its shit together and spends a ton of money to upgrade every phone in the world...that's still ~25-30% of the Android population. What about the rest?