[stoppingdown]

I think you're right, with exceptions. For instance: my first Samyang was the manual focus 12mm ƒ/2. I still have it and I've been thinking of replacing with the latest version, that has got autofocus, some optical improvements and it's lighter (and not very expensive). But the manual lens is still useful for certain applications, such landscape astrophotograpy, as you can pre-focus for landscape hours before taking the shot, when there's still light. Of course this is a very small niche of use cases.