It's not completely out of their arse, there was a PT & YC incident in the Chiefs v Canes final round match and it was a much much lower probability of a try being scored in that one (more obvious penalty though).
As for consistency, the best you can hope for is the same ref being consistent in the same match and sometimes not even that (see Buckman v Phipps).
Agreed, but more about seeing something in a semi that hasn't been seen all season, or the season before.
As for consistency, the biggest one is competing in the air, that is an absolute f*ckin lottery