its hard to say n the ref think I know they tried with utd ad say penalties at Old trafford
Problem is the better teams also attack more, and generally, foul less so its so hard to be definitive. Ie it was just more information to allow fans to argue.
IIRC surveys do show refs tend to always be “homers” and all teams get more 50/50 decisions at home than away
I am not sure that is intentional bias. I have no source for that claim but think I read it somewhere
I also think we should be more annoyed at cheating players than mistaken refs. A point you made so well 😉