That may well be true that one who is digiscoping, benefits fast helical focuser over dual focuser. I used to have Nikon Fieldscope 82ED and did some digiscoping with it and now as I remember, the fast helical focuser was good feature to have.
In other use, I found Nikon's focusing system just too fast and it caused quite much shaking when tracking flying birds.
In my usual use of scope, I don't need fast focus ability (i.e. to be able to fast focus for example from 300 meters to say below 10 meters) because I mostly need the scope for ID quite distant flying birds say about 300m-10km away from me. In that use it's much more important to have enough slow focusing because one is using high mags. and it's essential to have as little shaking as it is possible. I basically don't do digiscoping at all nowadays. Thats why my preference is dual focuser.
So as I interpreted your post, I totally agree with you, that what focusing system is the best option, depends heavily on what will the primary use of the scope be. And still someone likes helical or dual focuser anyway; it's also a bit individual thing.
Juhani
PS. I finally chose Kowa over Meopta and I'm now enjoying it's dual focuser (but which could be just a bit slower also...).
