Which is--in turn--dependent on clinical/administrative supervisors ACTUALLY providing meaningful proactive supervision of what their supervisees are actually doing in therapy. To be fair to those supervisors, they are overburdened with BS tasks as well.
However, instead of considering RVU totals to measure therapist 'productivity' as a therapist (it doesn't), they need to compute, analyze and provide feedback on more valid measures of actual productivity such as a measure of the average "age" of cases in your clinic, for example, for how long have you been seeing the pt in context of the current episode of care and what session # are you on. Crunching a months worth of data on pts scheduled appointments could be done very quickly and give you a snapshot of who has stagnant vs flowing clinics.
If provider A's patients are, on average, on session 32 (and been seen for an average of three years) while provider B's patients are, on average, on session 4 (and been seen for an average of 2.5 months), then you have some work to do as a supervisor.
But the 'I don't even wanna look' approach prevails.