Ram, any rational analysis of the changes implemented to AH by HTC since the beta would conclude that they are NOT building a high-fidelity aircraft simulator for the PC.
They have crafted an absolutely excellent air combat
game that has a very, very good flight model with a reasonable amount accurate elements and a reasonable amount of gameplay concessions.
You seem to be searching for "total realism" as YOU define it. Sit back, review the progress of the game and realize that:
1) You have input but no control. Beyond that, HTC itslef defines the "realism"... and none of us get a vote. Input far more than most other games, but no vote.
2) HTC has obviously shaded this more towards a great game than an absolutely correct high-fidelity simulation.. and they aren't going to change that.
Metric gauges? A very minor concession to gameplay in _almost_ every player's eyes.
Like the CA, there just aren't that many that really care.
So, you and all those millions

of other "selective realist" players that just LOVE the improvement that the Combat Arena made to the game might as well relax a bit.
Remember the guys crying about the fights being too far apart there? There ya go; SR rears it's ugly head yet again.
I'd like to see how many folks would dive into the CA if you got your wish for no autopilots and accurately scaled maps.
Sure, some would sit at their computer to recreate the BOB as LW. Takeoff, form up, fly to England, head home low on gas.
An hour and a half or so of flying with about 20 minutes of that actually in the combat area where you MIGHT find a fight.
Try to get them to set that up and lets see how heavily populated that arena would be.
... and that's why the wise folks at HTC have made the game what it is. Because
their way it's TONS OF FUN!