Turbos are (at least partially) to meet government standards that may or may not be related to economy and the economy testing may not be the same as real world economy.?E.g.--in some countries there are increased taxes as engine capacity rises. I personally don't believe that governments always know what they are doing.<snips>If I understand correctly, the raison d' etre for turbochargers is for meeting government economy standards.
The rest of what you say is perfectly reasonable.?