Zipper tabs on a pouch, why might one make a "split" zipper tab?

[AEBL]

This is a picture from the "Hahns Atelier" YouTube channel. I think it was "how to make a leather clutch bag" or something like that.

He used some leather zipper tabs. One side covered the entire zipper tape, which I had seen done before. The other side near the "closed" zipper side, was two separate pieces of leather. The design seems to work well, but is asymmetric, I guess.

I was wondering what the reasoning might be for making the tab two separate pieces instead of one tab? In the picture, it is the top left.

 

[mike02130]

To get the maximum opening.