In fact, I question whether they've even started phase 3 trials for this age group.

Seems the roll-out is the trial.

The salient point, as you highlighted, is why are we giving young people experimental vaccines to protect them against a virus that they're naturally impervious too?

Hidden quietly in the studies and reports it seems the most comprehensive protection against Covid you can get is to have caught it and survived it.

Weirdly, even those that have recovered, are still being given vaccines - they crop up in reports as having the worst reactions to the vaccine.