I'm with Sir O....its been happening for so long, who cares really. Oftentimes you get some extra bits though with the higher spec engine (BMW N52 "si" engines had an electrically actuated intake manifold and different programming that was somehow worth 35hp or something, and that's not even turbocharged).
While software-restricted detuning does irk me a little bit, its just a fact of life, marketing, product segmentation, capitalism, etc.