Twisted Fate's Stacked Deck

I'll be honest, TF has been my favorite champ since I started playing League a few years ago, but something has always bothered me. Why is it that his E, which is considered by most his weakest skill, procs every 4 attacks? Nearly every other champion that has an AA stacking mechanic is built around the number 3. Vayne's E, Gnar's E, Varus' passive, Vel's passive, Yasuo's q, Aatrox's W, and Jinx's AS windup with minigun are a few that come to mind. I'm just curious about why TF needs to wing another card to get a proc'd effect that is weaker than most? The only reason I can see for this is a stylistic one. Four suits in a deck, so the Cardmaster needs to throw each suit for a proc. However, isn't TF known for his deck of 3 cards: Blue, Red, and Gold? So by that same reasoning, shouldn't his E proc on the third hit? I guess I just wanted to know if anyone else noticed this. While I think it would be a nice little buff, I really just wanted to know if anyone else noticed this.