Speedcontrol,
Implementing your suggestion would require banning all responses to MA requests except from coaches/experts. That's not what this forum is about.
As Toddw correctly noted, "There are two sides to the MA forum: getting your turns analyzed and taking a crack at analyzing someone else's turns to test your comprehension of PMTS skiing."
When a non-expert (like me) offers an MA of someone's video, it is helpful that Max_501 or some other coach/expert correct any inaccuracies ("policing", as you called it). By this process, both the OP and I are afforded the opportunity to learn something. Your suggestion would eliminate such opportunities.
Max_501, jbotti and even HH have corrected my errant analyses more than once. My response was "thank you for taking the time".
Expert attention to your every movement and instantaneous feedback are available. But you'll have to pay for them like everyone else. I also work, but the time and funds I've spent on HSS shop work & PMTS camps are the best investments I've made in 30+ years of skiing. The free insights offered here are a bonus.