It certainly could be painful for the spectator if I were like 9, a totally self-absorbed, booger eating idiot, trying to show off in combat. Fortunately I'm none of those things and the last thing i'd do is combat. But yeah, allow a family member to experience the immersiveness of it without having to know anything about the game.
I thought about multi-crew too, but that'd require a complete 2nd rig...vr and all
Maybe using multicrew and a second account: At least then you're in control.
I boosted and piloted around an asteroid field using the window on the monitor to fly, while my kid had the headset on.
I just had to keep asking them to look straight ahead so I could ensure I wasn't on a collision-course.
It actually worked OK, but it would be hard to dock/fight/mine like that.
o7