All of my favorite strap makers such as Kostas, Corrogia , Aubystraps prefer to make it thicker in the traditional way but they make it as thick as u want. That’s of course true to other strap makers where the straps are handmade . I really prefer the thicker one with a thickness of 5,5mm. Its wear more comfortable and I like the look. It’s historically more correct . So after several strap revolution that had the triple folded technic so that the strap didn’t break in the lugs or on the holes. Which happen for example on the first 3646 straps. Here an explanation from corrigias homepage. But as often it’s a matter of personal taste.