How does 29 rogue twinking work

[Verdigostorm]

Hey, ive had a 29 twink rogue for ages now, but since legion everything is changed and i cant grasp an understanding of the guides. I am lead to believe that weapon speed is more important than item level. But the higher number the weapon speed, isnt that the slower it attacks? which would be bad? aswell as doesnt weapon damage factor into things, if someone can exaplin it all to me it would be greatly apreciated, (this is legion patch 7.1.5

 

[Sponsor]

The slower your weapon speed, the higher your attacks will be in Battlegrounds. That's how it works with the new scaling template