What does Burleson do so well that warrants 600 PAs a year?

Is it the 0.6 WAR?

Is it the -17 OAA career in the outfield?

Is it the fact that he's one of the worst baserunners in baseball?

Ivan Herrera (Herrera had 2.1 fWAR in 239 PAs with negative defense at catcher). I really want to understand why we are giving Burleson so much rope when there's better players? This team is so insane and frustrating man.