"Digiscoping" with spotting scopes is so wrong on multiple levels

They did an article on it in Amateur Photographer (British) in the Aug
1st issue. I didn't like it. So I sent them an email with 5-6
reasons why using a small astronomical scope was better. They
published it in their Aug. 22 issue. The main problem with spotting
scopes or "birder" scopes is that they don't have the focusing range
to be used in prime focus (no eyepiece) mode. This results in too
long focal lengths and slow focal ratios. There are other problems as
well.
The only real problem with using a small astronomical refractor
(though you can use compound reflector scopes for longer reach) is
field curvature. But that generally does not come into play as most
users of such things are focusing on the bird, or other wildlife
object in the centre of the field. Additionally, you can buy field
flattening lenses (positive lenses that flatten the field and reduce
the effective focal ratio and focal length, usually) for them anyway.