Actually sloehand we need both.
First all the data so that all gauges work, they see tracers, they see hit flashes same as we see.
Then a second dot command that would let us "slave" a trainee's views to ours.
Then they can see not only what move we made, but what we saw.
Ideally that would also lock them into the cockpit. (no jumping to a rear gun)
But it would be an additional Option sloehand, not the default.
A lot of new guys really do not get the whole up views thing. Another hard one is flying while watching back, back up, up, or up forward. If they could "SEE" how a good pilot does it. It would be easier for them to learn it.