So which one of you guys want to volunteer to try to do this with a 20" bar??? I dare ya! (Hint, it is a good deal more than 40").
And how many pros do you know that mill wood with a chainsaw? I suppose next you will tell me you can mill 28" boards with a 20" bar too!
Lots of pros can do amazing things with a saw, and I've see others that can't walk, talk and chew gum at the same time. What's your point?
You will not do the milling and stumping I have done with a 36" bar with a 20" bar in anything close to the same amount of time. Period!
Most of the pros I know run 440/460/461 with 20" bars as their main saw. But they also all have 660s, and they never wear 20" bars.
This is a stupid discussion, I'll use the bar and saw I'm comfortable with using, tough if you don't like it, I don't really care.