Scenario training. What a great thread this has been to read!
Lot of factors involved. Experience, as already mentioned, but resources as well. Some instructors I know have better resources than others. (just through luck of the draw) Some have friends that own bars that they can use in off hours, others are members of police departments with enough pull to use any and all of that department's equipment and personnel. Others don't really have many resources - but do a really good job despite that.
Another thing is the make-up of the students themselves. If the students are young adults, or police officers, advanced ranks, or housewives or fellow instructors or whoever - the depth and intensity of the scenario training could be quite different.
Some scenario training can involve the particulars of what you set up - and some can be non situational completely. For instance...I went to a nice recertification of DT. It was a week long training session. One afternoon we did what they called "A concentration scenario"
We took turns standing in the middle of the range. Three instructors each had a golf ball in a sock. They would swing them in an arc and let them fly at you. You were thirty - forty feet away, so it was no big deal. Then you put on goggles and popped in a mouthpiece and did it again. Then you did it again with vaseline on the lens of the goggles. Then again - this time they added the loudest, ugliest heavy metal music over the loudspeakers. (at this point I was purposely looking to get hit and killed) Then they added a strobe light. Then they started whipping the socks faster and faster.(man, those suckers stung) Then they cuffed your feet together. It was nuts....and a whole lot of fun. There was more to it, of course, using various aspects of vision, excluding noise, watching background etc.. By the end of the day we all had welts on our faces and knots on our heads, but it was a good exercise in concentration. Taken by itself, it was okay. Taken in context with the rest of the week's exercises and studies - it was superb.
Point being - some scenario training is probably more beneficial than others. But it's all good. it just adds to the students overall knowledge and, hopefully, abilities.
A few times every year, once class is lined up and bowed in - we have them go change into their street clothes, shoes included. Then we drill them that way. Other times, we bring them into the parking lot in the rain, snow or cold - and we train them like that. It's nice watching them fight in street clothes, especially on slick footing. (especially while I watch from the edges, all bundled up)
This type of training makes them look at things entirely different. (and teaches them never to wear really nice duds to class) it makes them reassess their own abilities and increases their awareness of factors they hadn't been thinking about.
I consider all of the above as scenario training.
And it's all good.