Old thread, I know.
For the majority of the keyboard commandos that don't run saw very much, or for the fallers where the weight of the saw is generally supported by the tree, the weight difference between a 44 and the various 46 offerings (except the 462) doesn't matter.
My profession involves fast-paced 16 hour shifts at the peak of the heat of summer, with an external bonus heat source nearby, in the nastiest terrain humans can traverse without being roped up. Add to that, the saw is used to cut everything from brush to 5' diameter trees and you're well away from the rig and not hiking back to grab a falling saw for a big pig. A majority of the time, you're cutting a 10-20 foot break through whatever vegetation is there, most of it significantly too small to support the weight of the saw, so you're holding it up with your skeleton and muscles. And the brush and small trees you're cutting have to be cut off square and as close to the ground as possible so there isn't a carpet of pungees to fall on. Also, you need to have energy left because you may have to race back to the rigs like your life depends on it, because it does.
So we need a long bar (28-32), but as light of a powerhead as possible, while still pulling that bar well for the odd 4' pig you have to drop. (Should be noted that we're primarily in softwoods)
Run a 44 back to back with a 46 in that situation, and you'll feel a real difference in weight. Hence why for the last decade I've built ported 44 hybrids for the task.