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I already know you're completely wrong with your 'combat speed default trim setting' statement
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In otherwords, forget any facts....
You are going to stick to your immature and emotional reaction.
Well, let's see how it pans out.
You can look in the Bf-109E3 Flugzeug Handbuch and see that the engine out instructions call for the pilot to pitch for 200kph IAS. This is best glide speed and corresponds to L/Dmax.
If our curves are correct, this will be the botton of the thrust required curve and tangent of the power required curve.
First the Thrust and Power Required curves:
200kph = 124mph +10 mph PEC = 134mph CAS * .869 = 117KCAS = 117KEAS at sea level.
Yep, best glide aligns perfectly with our curves so we know the curves are correct.
Using the curves, it is easy to find the other cruise speeds.
Maximum endurance will be at the point of minimum power required. Carson's speed is a modern innovation and is the best balance of fuel consumption and speed.
The trim speed of 400kph IAS does not align with any cruise point on the curves.
That means the speed was chosen for a different reason.
Now it we look at the rate of turn, or how fast an airplane can bring the guns on target, we see that 206KEAS is a point the Bf-109E3 maintains a healthy rate of turn advantage and can sustain better maneuvering performance.
So, if it was not intentional, it certainly was a very fortunate turn of fate that the Germans choose 400kph to set the trim for the Bf-109E3.