I see this a bit differently.
Uber and AirBnB caters to immediate needs for a short term engagement, so the dispatching capabilities are the real value (find me someone who can do X right now).
Homejoy is dispatching for a long term relationship, so it has a hard time staying engaged in the relationship as it progresses.
I think the skill is less important than the duration of the engagement for a dispatching service like this.