It's not a point of selling the PS5 is better, nobody will have any reason to buy the PS4 Pro at all, they are literally killing their own product.
I know they want people to move gens, but for people that are waiting for a cheaper system to get into the current to be old gen... they just won't have any option.
Better phase it out than to let it be priced the same as the next gen version of it.
What's wrong with killing their own product? It's not like it's a child, it's a product line. When it no longer serves a purpose be done with it.
The PS4 Pro was designed for those who wanted the best graphics available... That market now is better served with a PS5 or Series X. I could still see a function for the PS4 Slim as a low cost entry point, but the Pro doesn't really serve a purpose anymore.