You already figure it out from the pro side, but it sadly is not enough on the casual side as well. The issue is streamers would show their audience how easy it

You already figure it out from the pro side, but it sadly is not enough on the casual side as well. The issue is streamers would show their audience how easy it is to cheat and this would lead to a perception by more casual gamers that cheating is rampant and so they would be less inclined to join. This reduces the audience, hitting worse match making (as you suggest), lower stream viewership, less game success for the studio, etc.