The cut of a tie depends a lot on your own body type. The skinnier you are, the skinnier your tie should be. Younger people also tend to gravitate towards skinnier.
I wouldn't own only "skinny" ties, but I do find myself wearing mostly them. I just find it's pretty tough to wear a "full" width tie these days and not look like you are just wearing your dad's hand-me-down ties.
It's not my favourite photo of myself, but this is one of my favourite ties, a 100% silk CK "skinny" tie:
Mark