I deliberately was talking about decode speed. The question is if you serve even via moderately fast infra, does it display faster? In my case on a (indeed fast) local system absolutely not. Mere size can be a decode problem of course. But it's extremely hard to tell that a single digit percent size difference is an advantage for serving.

But if better compression for storage or you can verify progressive serves faster then it is of course a benefit.

I guess the point I am making is that most people think: I heard it's somehow better so lets use it.