Substitutions in friendly matches

I propose the possibility of making more than 3 subdtitutions in friendly matches to test our team.

You can do as many changes as you want before game, should be enough to test your team :D

Maybe I wasn't clear, I'm asking to make more than 3 substitutions since it's a friendly match, plus you can't field the expelled players, which is the wrong option in my opinion because the friendly has nothing to do with the championship or other competitions.

How would you judge how the players are doing by switching out so many players?