In some combative classes, KISS was the rule. Forget pressure points and soft spots. If you get the guy down, pound him the head repeatedly.
The key to all the tackling is distance. The successful folks could close.
At VT, a student trying the classic football tackle took multiple rounds and died. Other students have taken a round in a nonvital and got to the shooter.
Another argument for FOF - in one, an current Army vet - vaporized me when I decided to go for him. In another, I disarmed someone. Of course, the charge of the FOG may leave something to be desired.