Arcdps is not only a dps meter. It shows healing, boon duration, boons ripped/corrupted etc. This helps a lot to determine how good a theorycrafted build is. If you are some kind of dps build and if you are doing open world, yes. For fractals/raids, no. I think it's possible to do around 15k without buffs (might, fury, ranger spirits, warrior banners etc) if you go a meta raid dps builds. I also know full dire stats fire weaver does 15k without buffs in open world. If you want to increase your dps (why would you want to increase it, I don't know) try practicing/theorycrafting on the golem in lions arch aerodrome.