Violent agree on variance in value produced. Violent disagree on that junior, senior or other titles or roles have such strong correlations. For very simple reasons: we can’t measure value, and we absolutely can’t measure value within a performance review cycle.

The most devastating value destruction (aside from the rare intern deleting the prod db) that I’ve seen consistently is with senior/rockstars who introduce new tech, takes credit, moves on. There’s a reason for the term resume driven development. Think about what a negative force multiplier can do for an org.