Two- versus one-part tangs

[S/V Liberty]

Are two-part tangs (i.e. tangs which accept eyes) superior to one-part tangs (i.e. tangs which accept forks)?

It seems to me the one-part tang has the big advantage of guaranteeing fair loading of the clevis pin provided only that the angle the tang makes with the mast provides a fair lead and that the clevis pin hole is drilled at a right angle to the tang itself. With two-part tangs, particularly those in which one part is bent twice to accommodate the eye thickness, you have to get both the angle with the mast correct AND drill the holes in the two parts in just the right places in order to get fair loading.

I have seen one boat where one part of the two-part tang broke, and the second part lasted long enough to get the boat to port for repairs. But perhaps a thicker one-part tang wouldn't have broken in the first place?

Perhaps the reason is that the two-part tangs can be made adequately strong using less metal and are thus lighter? Or provide more space between the inner tang surface and the mast so that a single-part tang would have to be longer (and thus heavier) to provide the pin and cotter enough room to clear the mast?

I must be missing something.

Seth