Cam button / stock timing chain cover

Has been brought up before wether the button is necessary or not. Many posts later the verdict seemed to be it was necessary. Seems to be a very small portion of people that go without.
The rollers do not have the shape of the lifter or cam lobe to to keep the cam from going forward.
I am going with the aluminum cover. If I do not go that route modification of the stock cover is not that big of a deal.