Story Points are inherently team specific as is Velocity. Trying to normalize them across an org for the purposes of a performance metric is folly. Velocity should be used internally on the team when doing timeline estimations, but exposing that outside the team is, again, folly. Even on a singular team, SP and V are subject to small drift or large corrections based on team makeup, time of year, or numerous other metrics. They are simply a planning estimation tool. As others have pointed out, the act of assigning SPs is a useful tool itself as it requires a team to collaboratively estimate complexity and it frequently helps surface miscommunication and missing details.