When it comes to the young and inexperienced, I just don't trust them enough to give them anything they can screw up, where it will matter.
How they might screw up:
1. Being unreliable: either not sticking with tasks, no matter how exhausting/boring; breaking protocol; breaking orders; breaking things; or much, much worse.
2. Being too slow: not meeting deadlines.
3. Causing the team mechanism to break down.
4. Creating more problems, that other people have to dedicate time to fix up.
etc.
If you can trust someone to do menial tasks reliably, then you can trust to do other tasks reliably.
I expect people earn: their pay, their position, my trust.