Makes sense for them to all use the same unit account but to price based on supply and demand?
I.e. the system that's stood the test of time?
I think the confusion can be summarized as follows:
1/ Bitcoin is an open source protocol that used a token to incentivize the developer (Satoshi) and service providers (miners).
Therefore, other open source protocols can be built using this token incentive mechanism.
2/ The flaw in this argument is that Bitcoin is an open source protocol SPECIFICALLY DESIGNED TO BE A "MONEY" APPLICATION.
Therefore, there's an inherent incentive to hold Bitcoin, not to just use it to transact, because Bitcoin is designed to be money.