What would make a government to rebrand their traditional currencies just to edit some graphic designs with excessive amounts of money bills involved to execute such project that doe not mean to brings more values to the currency neither does it boost the economy level of the nation?
The government may be wrong on some decisions, but they are not wrong on all decisions, and as citizens criticizing them may be easy, but they are not always wrong. It is not an abnormal thing for the government to change the design on their currency, the problem becomes when it is now done more often.
Changing the currency can force people who have kept money hidden away to come out of hiding, or render the money invested in the production of counterfeit money in mass to be wasted. Government have their reasons that is not always made known to every citizen because it cannot be understood by every common citizen.