Ranger the iconic hero which longbow is supposed to be associated with feels like has some of the worst skills, traits, and specializations for the longbow.
With a slow rate of fire, it doesn't benefit much from critical, which is why many people go for power.
With so many utilities heavily focused on condition damage - you and up crippling your self if you go with Longbow on Raids \ Fractals.
Some changes I think would benefit LB Ranger
Opening Strike changed to -> Sunder
Quickfire applies stacks of vulnerability
Precise Strike Changed
First shot while invisible always critically hits
Remorseless changed to
Critical hits reduce cool down of hunters arrow by 1s.
Gains Ferocity when invisible
Creates a Dark Field after you roll back
I feel the changes would allow Longbow to be very valuable in single target damage and better combo with each other, first applying vulnerability stacks then firing hunters arrow and following up with a critical.
This would make the hero more valuable in endgame content without having players thinking conditions are the only way ( as it is currently the best damage option for ranger )