If you want to play the violin beautifully, you have to practice for 10 years, there's no way around it.
If you want to do important things, you have to train in all sorts of capacities, and put in a lot of sweat.
One of the things that differentiates humans from beasts is that we have at least some sense of higher purpose and many of us derive considerable fulfilment from that.
For the most part, most of our education is necessary - and the ability to focus, to plan, to think beyond just a few steps, to control one's desires and emotions, to concentrate and balance one's life energies - this requires education and maturity.
Yes, it can be stifling in some ways, that's ok, we want our doctors and accountants (mostly) to be small-c conservatives. Others can write Operas.
But none of it comes without a formal journey at least in some capacity.
It's a neat experiment but I think it's hard to determine the results. The novelty of exploration in that context just might not be 'novelty' from the adults perspective. Try trading rewards for truly novel things, like, jumping out of planes, I wonder what the result would be.