I'm late to the party. Sorry. Why do such articles not distinguish between the cheapest and that which is the cheapest? Including this one. One might reasonab

I'm late to the party. Sorry. Why do such articles not distinguish between the cheapest and that which is the cheapest? Including this one. One might reasonably make a long-term policy for new power plants such as "40% of new power from the cheapest source, 20% each from x, y and z". If x is cheapest in a particular year then gets 60%, and articles tend to describe it as if the preference were "60% x, 20% each from y and z", see? Why is that?