I don't know if Anet still "monitors" their trait and skill changes, but I think it's safe to assume that out of all the weapon trait changes they did a little over a year ago, this was the worst looking one back then and it still is. This is effectively only a "reduced cooldown and piercing" trait for the longbow (and the harpoon gun.. ehe), which for a GM trait is at the very least underwhelming compared to any other GM weapon trait.
My suggestion is simple. Scrap swiftness on projectile combo finishers, and reintroduce the old functionality from pre-specializations Remorseless: regain Opening Strike when gaining stealth. Longbow has stealth, the trait still works without longbow, it bumps up Opening Strike synergy from one to two GM traits, and it's kept in check by not being able to trait for Remorseless damage at the same time (so no easy stealth-into-Maul shenanigans with a ridiculous modifier attached to it).
To further touch on Opening Strike's lack of synergy with anything other than Remorseless, there is also the possibility to add the last remaining function of the old Remoreless trait (regain opening strike when killing a foe) to Predator's Onslaught, which seems fitting for a PvE-focused trait.
I know Opening Strike/Marksmanship rework suggetions have been posted plenty of times, but I think this is a subtle and easy way to give Lead the Wind a meaningful functionality outside the weapon modifiers, while at the same time adressing the uselessness of Opening Strike when not running Remorseless without doing a complete rework, overpowering it or having to shuffle traits around.