The point is you could do this kind of simulation also against non friends
I.e. If you have a CL final and don't know if your tactics are good you can press the button and you get on-the-fly simulation:
- No consuming of rests/morale pack
- Your opponent does not know you have done a simulation (of the outcome of 10 matches against him
- simulation does not affect team form
- And as said before could be done against non friends
- And in a very very fast way (simulation of 10 match outcomes)