Yes, it's more weight but when you hit something like this---
P1000340-XL.jpg
It's much easier to drop the pack (opportunity for a reststop) and clear a way instead of fighting thru with a 90 lb pack.
P1000341-XL.jpg
VOILA!! Cleared. Then when you come back to the area a month or two later, guess what? The trail is easier to get thru. It's amazing what a 10 inch folding saw and pruners can do.
In a perfect world, ALL backpackers should be required to carry hand pruners and clip as they hike. 99% do not.