Token value perhaps, under very low volume (think single digit users). But imagine millions or billions of dollars a day in transaction volume, looking at a $5

Token value perhaps, under very low volume (think single digit users). But imagine millions or billions of dollars a day in transaction volume, looking at a $5 payment at a cafe and then trying to figure out which of the people whose been assigned a $5 token to in the past month might have shopped there - it would be absolutely futile. Taler wallets just sit there until you use them, much like cash. Realistically, there would be too many degrees of freedom to create a matching from merchant to user, even if we additionally assumed a ton of metadata about user/merchant location and such.