The big issue you have is a DT system generally has to be as lean as you can physically make it. Every move has to multitask if you can get it to.
So you are limited by what you can teach a bit. Now from there you would almost have to include a basic sweep and a basic get up. And it would take most of a day to get that functional.
Add to that good position and good hand fighting. Because belt kit. And punching/stabbing/shooting.
So there is to a certain degree an order of importance. If You can be out of guard that is the first place to be. Even to a fifty fifty stand up. Because you don't have to re engage. Because space works for you if you have a tazer bat spray and gun.
I'll address the first thing. My point is NOT talking about other police departments in the world, it is focused solely on the lack of experience YOU have. You are projecting what works for you, in your environment. Sorry your environment and kit isn't the same. The Gracie DT system, PPCT, LOCKUP, Code 4, and more aren't just taught in the US, they simply started there. Other Countries have started importing them from South and Central America to Europe. As an example I have traveled to England and Germany and spoken to cops there. They have said "in terms of regular police work we are equal but when it comes to DT we are about 5 years behind." As for them not being questioned, if they weren't questioned you wouldn't have multiple systems.
I think you also miss that these are NOT martial arts. They are called DT for a reason. All of them are designed in a specific way to address these following factors, before you even get to the things you still, for some reason, senselessly dismiss because the requirements are beyond your personal experience.
1. Anything taught by a Police Department HAS to be standardized and have a pedigree that will stand up in a court of law.
2. It needs to address the fact that Police Departments will NOT pay for officers to be trained weekly, and over a LONG period of time as is required to really become competent in a more formal Martial Art. So you have something that is taught in an immersive matter of a day or course of days and then is "refreshed" by individual practice and recertification courses.
After those two big things you look at the following 2 key facts. 99% of the time this is the nature of the suspect...
1. Little to no actually training in terms of fighting
2. When they fight they are fighting to escape, not to beat you.
Next they are designed with the following in mind
1. To hold on and get the suspect in cuffs or so you can disengage and go to a tool.
2. If the above can't happen hold on until the Cavalry arrives, it is coming, and then weight of numbers wins the day.
A perfect example of #2 was the last Saturday into Sunday. We had a huge brawl, Just the two of us who could respond (we also had a burglary in progress at the same time) couldn't handle the numbers on our own so we asked for an assist to be toned out. My wife works for a department over 30 minutes away, but in the same County, so she heard it over County Wide, and would have started my way if she wasn't the OIC because every department in the County heard "officers need assistance, X city, Y address."
DT are built with very specific and different purposes in mind than Martial Arts. Do I personally prefer "real" martial art(s) yes, otherwise I would be spending money out of my own pocket BUT in terms of the specific purposes and needs of LE, DT do an excellent job because they account for the specific dynamics;
purpose, equipment, environments, access to back up via radio, the nature and purpose of the resistance you need to overcome, civil liability, skill retention (hence largely gross muscle skills) etc.
If you look at it from strictly a Martial arts perspective you will see things lacking BUT if you look at things from a LE perspective you see it is there by design.
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