Arcanist relies heavily on Winded to reach peak damage numbers. Most Arcanist trees take Winded and at 10 winded around half your damage comes from Breathless. With t2 rift aspect this becomes closer to 70%. While the most recent patch notes reduce this buff, I feel that this merely reduces the damage potential of Arcanist without addressing the root of the issue--Arcanist should not be relying on winded for damage.
Reliance on winded limits arcanist's damage potential since you can only increase your damage through self-buffs by about 50%. Compare this to Fallen, which gains up to 150 raw and 115% damage from corrupted, 30% from armor breaker, and 20% from bpact; or even Riftwalker that can quadruple the meteor multiplier with 60 timelock. You could say that Arcanist makes up for this lack of self-scaling by being convenient and not bursty, but I think even if you ignore the dps numbers the lack of scaling potential in 10 winded makes the class less fun to play as well. (I mean, it's called DPS for a reason...)
Also, since winded is a riftwalker ability, it fits rather awkwardly into Arcanist's kit--since you don't have gust you need to rely on a winded slave or take time away from spellspamming to melee. This is especially annoying if you're playing a build with slower attack speed like echoes quetz. Not to mention that it's rather illogical for a DPS archetype to have its main form of damage self-buff be from the other side of the ability tree.

