Builds builds...builds waa!!!
Viable for what? You gotta be specific. There is no build that is viable across all game modes.
P/P, like any condi build is going to be fine (although not ideal) for WvW and SPvP, but not good for PvE.
Warlord Sikari (80 Scrapper)
I am sorry, mostly viable for roaming WvW which I also hope means viable for sPvP
Well double kit condi is still a really good build for both Roaming and sPvP. It was the meta a while ago. The reason why celestial rifle replace double kit as the ’’meta’’ is because of the its versatility.
Both have about the same defensive problem. They both have limited condition removal and stun break/stability. Making them both vulnerable to heavy cc and condi pressure. But the difference is in the offensive capability.
Double kit is extremely powerful against other build with weak condition removal, but suffer a lot against build like Shoutbow.
On the other end, celestial rifle can burst with both condition and direct damage, making it more versatile as you can put different type of pressure on different build and exploiting their weakness.
But Double kit still remain a solid build. It will do better then celestial rifle in some fight, but will do better in other fight.