Professionals in ALL walks of life pursue independent training, not just what their employers offer.
That sounds the same across different professions on the surface. But, it really isn't.
Let's say I work IT. I pay out of my own pocket to get Cisco certified or MS Network Engineer certified. Let's say I am a pilot, and I got certification to fly more complex type of aircraft.
I now own a marketable skills that makes me worth more. If the employer refuse a pay raise? I'd look for a job that will pay me for the extra skill I got which person without that certificate cannot perform.
"Hey your database is getting obsolete and I am the only one certified from the manufacturer to manage the new system. Don't want to pay me? I guess you'd be happy with the old OS that will run out of support next year."
Now, let's assume I am a police officer.
"Hey boss, I graduated the Super Duper Pistol 1000 course at Whatever Cite and now finished the Scary Carbine 9000 course from Hula Hula Ranch." The most likely response I'd get is, "Good for you. Now go back to patrol. No, you don't get a pay raise. We'd have a promotion board and we'd promote the next guy who gives a politically correct answer on a bull**** question given by a clueless HR goon, but feel free to bring up your training."
if you're not interested in learning and mastering your duty weapon, perhaps you're in the wrong profession.
The fact of the matter, how disagreeable and terrible it may sound on the surface, is that this is just not feasible for law enforcement.
Master? Define "Master." For most othe professions, it is easy. IT personnel only needs to master IT. Doctors only need to master medicine, and not even all of it, just their practice area. Pilots only needs to master piloting.
For a cop, that isn't the case. Master a pistol?
What about rifle?
What about baton?
What about Taser?
What about driving?
What about law?
What about investigations?
What about crime scene processing?
You can expect certain degree of proficiency in all of these areas, since it is critical, but "mastery" simply is not feasible.
You can expect a dedicated person to become either Bruce Lee or Rob Letham or Sherlock Holemes.
But, it is totally unreasonable to expect someone to be Bruce Lee AND Rob Letham AND Sherlock Holmes just to perform "a job." Yes, in the end, it is just a job.
And, even on top of that, the ignorant public would still say "What? Cops don't know special techniques to handle dogs without guns? What? Cops don't know how sensitive I should feel about them not respecting my dirka dirkastan ethnic culture that I have no business demanding Americans to conform to? What? Cops don't know how to diagnose mental illness better than a licensed physician that released the VT shooter from hospital? That is totally unacceptable!!!"