I'm quite sure that we'll
end up with a realistic sim because that's what the majority of the vocal section of the community wants (obviously there are probably quite a lot of people who have bought the sim but don't post and so nobody really knows what
they want...).
Provided that people keep posting data, which they will, the chances are that things will progressively get fixed over time.
OTOH, I suspect that quite a lot of what's going on at the moment is about quick, pragmatic fixes rather than for example trying to get the perfect tachometer in one go.
I would imagine that switching the tacho type to electric is just a quicker way of reducing bounce than rewriting the mechanical tacho code.
I would also point out that stuff like instrument behaviour is very technical and quite specific. AFAIK some of the compass parameters we have are currently taken from Russian compasses of the period, presumably because it's easier to get a WWII Russian compass in Russia than to get a WWII British or German compass.
It's therefore quite possible that the mechanical tacho model might be based on Russian instruments of the period rather than British ones, resulting in different behaviour despite the fact that the mode of operation is nominally the same. So we might get more realistic instrument behaviour post-patch, even if the drive mechanism is wrong (which I suppose might impact the DM).
As for the carburettor stuff, it's complicated, as the 10 page thread on the subject attests. I suspect that again, the behaviour mentioned in the beta patch readme is a pragmatic quick fix rather than the last word on the subject.
So at this point I'm probably more relaxed than the average person here; I'm in this for the long haul, and view the next few months as more of a large scale public beta than anything else. We'll get there in the end.