This is the key for mine, there needs to be an acknowledgement of doubt and a reduction in sanction because of it.
The other option is to concede there is doubt, mitigate to a yellow and allow it to be put on report and dealt with later when they have time to consider it more.
The reality is when you are standing on a field, looking at big screen (of varying quality) from a distance, you are time poor, it might not be the most optimal way to view of replays to make decisions. You are reliant on many factors and without information such as available angles etc.
IMHO, they need an on field decision (or clear call that the referees did not see it so can't make any decision) then it goes to a bunker / TMO who make the ultimate decision and if there is doubt it get referred to a judiciary post game.