Makes no sense since rockets are still more expensive, but satellite guidance is easy to jam. Those are just two fundamentally different types of weaponry that are being used under different circumstances. Traditional artillery is a cheap way to fuck up single or multiple targets. Katyusha has been designed by us to cover areas with German artillery, after 2014 MLRS like Vilkha in our doctrine are considered to be the ultimate way of destroying invasive convoys at the beginning of war - that of course do not look like a square areas, and this is where modern guidance is helpful.