The climber gets paid to cut the tree, in whatever sizes are most appropriate, the groundies are there to shift stuff. Why have them spending time sawing when they can be shifting?
I've worked for companies where I've had a bollocking for cutting pieces out that wont go in the chipper when it was perfectly within my abilities to do so.
Also I'd get yelled at if cutting larger pieces and not having the common decency to make them land facing the chipper, or drag route, butt first.
The Climber may stay in the tree longer, but in that time the debris should be cleared efficiently and if that means it can be done without groundies having to fight to pull apart big messes of debris and go back and forth picking up a saw (I would assume the saw is kept away from the tree when not in use, as apposed to the climbers saw which is always to hand) then all the better.
Also surely there is an argument that, although the climber may be exposing him/herself more risk due to increase cutting, he is also reducing the risk that the groundies are exposed to? Plus smaller bits falling=less risk.
(for rigging, go huge. Different story altogether)
Is correct body positioning in the tree with a ms200T in both hands better for you ergonomically than a groundie reaching into a mass of debris with, say, an ms260, making awkard cuts? So the climber is helping his groundies by preventing them from working in dergonomic positions (I made that word up, it means bad ergonomics)
Where are the most accidents, in the tree or on the ground?
I don't know, please find out and let me know.
I will concede that if the groundie is the most experienced then, sure let the climber do less, but mostly its about dividing the labour evenly between everyone on site, except the boss, I've got calls to make, although I sometimes do them in the tree while the groundies are hauling half a ton of limbs out of the river.
There is no "I" in team, but there is a "me"!