So, let's not argue from authority now, that wouldn't be very fun.
Even still, we've accepted the general framework that transacting and storing value are separate acts.
Let's use 'property' in place of money. Or any term you'd like! Asset, currency, what-have-you. I don't mind any of them.
I claim that storing value is an important proposition for any property. Bitcoin clearly stores value orders of magnitude better than Monero, as measured by the market value being 300x.
Hm, wait I'm back to claiming 'market value'. Why is that? Well, we can just exchange Bitcoin for Monero on the market instead of dollars, maybe that will help us understand comparative value better.
But wait, this wouldn't matter if we do the exchange on a permissioned market like you said. So let's compare over a decentralized market instead!
Wait, the prices and relative values that I see from these decentralized markets reflect the same relationship as the permissioned markets.. that's weird.
I wonder if free market value could be seen as an attempted aggregate of the value propositions that individuals claim for themselves when doing their own assessment of their options with their property?
That would make value, and value propositions subjective.
Maybe you are missing something when you say: "the value prop of bitcoin is..."?
Otherwise you surely would expect the value in the dark markets to even out, and even for Monero to overtake Bitcoin, as it clearly is more valuable? Is that what you expect?