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What, why would you need to do that? That's not how preventive medicine is tested.

Please explain how would your proposal be any more valid than a proper controlled study where you do the treatment on portion of your participants and wait how it works out for them.

Efficacy is still tested with vaccines because there is a statistical expectation of contracting a given disease.

If you give 40,000 people a random mix of placebo and vaccines and then monitor whether or not they contract the target disease, you get an indication of efficacy by comparing the vaccinated group to the placebo group.

If it's never been done then I don't understand how this is specifically problematic for the covid vaccine then.