Just like any technology, it took time to mature. You are hard pressed to find a brand new analog oscilloscopes today. WHY? Because, they provide enormous benefits even if the bandwidth was identical to analog counter parts. For one, you can't fricking store a waveform and look at it later (!!!)
We do a lot of high speed triggering in my electronics lab, and i can tell you that most low grade digital scopes cannot trigger fast enough. The $25,000 digital scope works, as do all of our old analog scopes.
The claim isn't that analogue oscilloscopes are generally superior. The claim is that they have responsive user interfaces, which digital equipment often does not, or at least didn't use to.
It's not even that it is, or was, impossible to make digital equipment with responsive interfaces. It's rather that the easiest way to do it often involves a delay.
