And with a cyberjack (or living persona), some Major Actions are demoted down to Minor Actions.
Can you provide examples of that? I have yet to notice any such benefit.
Matrix Perception.
I thought there was more than that, but there's that*.
*It requires cyberDECK, not cyberJACK to go down from Major to Minor. Still, not having to "waste" a major identifying icons for an emergency, mid-combat hack is a big deal. And if you're in hot sim, using Matrix Perception to spot your targets then spending 2 majors to hack them... you're in effect getting 3 major actions!