The only nerf she needs is for devs to decide whether bob is a tank or dps. He needs to not have both passives
He is neither because he is a turret.
Ashe is also countered by shields. It can stop a ton of her damage and forces a lot kore wasted shots which increases her reload time drastically.
She is still a marksmen meaning every shot counts and that forced downtime to not only try to sneak shots into the enemy team she has to continuiously keep adjusting her positioning.