Question about rogue weapon damage

Is +weapon damage on a bow/crossbow a wasted stat on Dance of Knives build? Specifically with the Star Shards upgrade that turns it in to a marksman skill?

I’m coming back to Diablo after a long break and I don’t really understand rogue weapon damage calculations so I’m trying to figure out if my crossbow is just a stat stick and if I should actually be crafting one without +weapon damage or if all weapon damage is applied to all skills in which case I should probably keep the roll.