Correct. I own a few of CS's birds (B732, B721/2 and L1011) and although they look great and visually add to the immersion, their lack of systems and performance simulations totally destroy the enjoyment as well as discourage you from "investing" your time simulating a flight with their aircraft, especially when there are others on the market which does (although not the same aircraft type).
Aspects of the aircraft which appeal to me most are the flight path calculations and tracking, fluid simulations (oil temps and pressures, fuel temps, air conditioning and pressurization, and all of the effects of the current environment on them), engine performance and fuel burn to specs, and last but not least electrical simulations.
I don't think that's asking the impossible since a lot of other devs program such features to some degree into their aircraft, which is why I'm not opposed to the price they are asking, just once it's not one of their "usual"releases.
For those brave ones who did purchase this software, some feedback on the accuracy of the behind-the-scenes simulations would be greatly welcomed for the rest of us who are interested but cautious.