I still think that the original Wagtail Combi is the best trad tool ever made, I have used one for years and I think I am pretty good with it.
Having said that, I would find it impossible to carry out work to my standards using one on a pole.
There is nearly always some little bit of detailing to do, even when i am standing in front of a 4ft square pane.
How do you clean split frames with a pole? If you can't wipe the bottom of the top pane, what happens to the drips? And how can you wipe over the bottom of the frame and the sills?