In reality, its just the auto attack that needs the buff. Rapid Fire and Hunters Shot are worth taking LB for alone. If nothing more than priming your target with vulnerability and burst while you travel into melee range. Point Blank is kinda meh, but comes in handy if you switched to range to kite and heal. Barrage is excellent for tagging mobs for loot/AoE trash mob damage, and the cripple would be nice if CC meant something in this game.
What makes rapid fire worth taking? I've found it doesn't do much damage at all, less than auto-attack at max range. And shortbow is better to rely on on-crit effects. Hunter's shot is nice, but I can't see taking LB anywhere but maybe a little in WvW.
I doubt Anet holds the same opinion on what they considered 'fine' a long time ago by this point, so lets hope for a little update to longbow in the coming month or two.