Some people think that the three tabling rule will help vs various ways of cheating your way in. One example is that it gets harder for people to live coach someone while they play if its 3 tables. Unless they control the mouse themselves that is.
But to be 100% honest with you, it wasn´t much of a discussion. 30s and 100s had introduced it ages ago and people started requesting that we had the same rule. We try to keep all the EV divisions very similar but with 30s being easier to get into than 60s and 100s being harder.
So to answer your question, we introduced it because others did
.