Keeping a record of everything hapening in the world in every nodes is not needed. (even stupid) You don't need this security level for day to day tokens, just for the base money you will use to convert from time to time to buy tokens
Shows a fundamental misunderstanding of what the purpose of a ledger is.
Nobody cares that a billion people bought coffee today.
Everybody cares that those billion purchases were not allowed to inflate the money supply.
So? Everything on the same ledger? Herp.