Rugby presents a unique challenge in that the referee is required to make a specific decision about a contested tackle almost 200 times a match (once every 30 seconds), and this decision is multi-dimensional, instantaneous and open to interpretation...
Consider that a typical match has about 170 rucks (or contests for the ball in a tackle) , and you realise that there are probably 100 decisions (because not all are contested the same way) where the referee must interpret, in a split second, a dizzying array of laws, and where each decision has implications for what follows.
Why do we do it?
Because we love it.
The Rugby Ref