How often in a real fight are any of the popularly-espoused, school-taught tactics employed? Review various fights caught on video and note how often the solution was (or ideally would have been) to present a firearm and land quick hits with the only additional necessary tactic being a little bob and weave.
From a vehicle:
At a store:
IPSC shooter working security:
At another store:
In front of an elevator:
While not common, shootings do happen to good people sometimes. When they do, those people often have zero formal tactical instruction from popular classes.
The successful ones respond simply: Draw and land hits as quickly as possible, usually with little else needed. You’d be hard pressed to find a video of a successful defensive shooting where the defender used any of the techniques popularly taught at various schools.
Many of the most feared gunfighters of the 20th century used tactics and techniques that would be considered passé today. A surprisingly large number of them were involved in competition emphasizing static slow fire (Bullseye, PPC, etc.) that doesn’t test the timed movement, gun handling, and rapid-fire shooting on multiple targets found in practical competition. But they fought successfully many times. If they were still in service and in their prime, they’d probably fight quite well today as well.