I'm sure we've all played one of those teams that have their strategy set so that every time they go into contact, while carrying the ball, your player fouls in the tackle and they get a penalty. I think something has to be done to address this - it is a manipulation of the, pretty basic, strategy sliders and it is incredibly boring and frustrating to have to endure. I suggest an overhaul of the strategy sliding bars so that this form of match fixing can cease.

That strategy only works if you have your own sliders set so you foul. And in so doing, it's your players that are cheating and preventing your opponent from scoring a try. The sensible thing to do is to work out your own strategy to deal with this - which is what the game is all about.
What would make the game incredibly boring was if everyone played with the same strategy and you weren't able to radically modify it, and I'm afraid that's what your suggestion would lead to.