Hehe now you're getting into the weeds! But if you want to go there......

For many uses it may not matter. If you're flying precision aerobatics, 3D you can get into some pretty serious tuning with prop choice.

Some props like APC, will out perform the same size wooden Zinger prop because the airfoils are more efficent or smoother. You might be able to get the same RPM on a 10x7 APC as a 10X6 cheapie wood prop (for example) or more rpm just by sticking with same size.

So to say you "have" to fly a Scimitar prop is hogwash. Though for some uses they may be a better choice. Personally I hate the things, they are too heavy and don't spin up fast enough for me, I use Xoar or Vess props. But the style of flying I do demands better response to throttle than I can get with a Top Flite prop.

3 or 4 blade props load the engine more so if you have a 10x6 2 blade you'd probably have to step down to 9x6 3 blade. A 4 blade would be worse. Now if you stuck that on the front of a Corsair as you used for your example, the prop tips would barely clear the cowl unless you have an oversize engine on it.

If you look at the big time scale guys they have pretty multi blade props for static judging and 2 blade props for the flight rounds. (yes not all of them but a high percentage)