Is it our fault? No. Why play a game if you know nothing about cars? Well, I'd hazard a guess you don't really know much about cars (judging by your argument skills, general posting style, and the use of speeeling, punctuation# and grammar), but just think you do because you've read Max Power magazine (or the Aussie equivalent). If LFS was totally realistic I very much doubt you'd be able to choose an inlet manifold given the parameters for pressure/flow, heat transfer, pressure drop, length(s), etc, or how to work out the primary lengths of your exhaust manifold.
"Aha," they usually say at this point, "but I didn't mean that real, cos that's just silly." So now you don't want it realistic, despite you saying you wanted it as realistic as possible? You want a dumbed down NFS/GT4/Forza/PGR style tuning system where adding a stage 1 turbo = +40 horsepower and a medium camshaft = +15 horsepower.
You see, it just won't work. You either have it realistic and have only about 5 people understand it, or you have it dumbed down and lose the focus of LFS. At the end of the day we can have this:
Close racing
Equal cars, so it's just about driver skill (with a setup to match his style, but perhaps these should be fixed on some cars too)
More programming time on important things like tyre behaviour or aero modelling, or gravel trap design
OR:
Ricers
Silly cars with phat wingz
All cars turbo'd
less close racing
A sim dominated by 11 year olds who think they know about cars
less programming time for good things
dissolutioned, well, everyone
less fun
but arguably more realism if done absolutely 100% properly, in which case no one will bother anyway.
P.S. I meant this all in a nice way, but re-reading it has made me think it's come across as more agressive than I intended. Ignore that, and pretend I'm smiling whilst you read it (or doing that face <--)