It would be counter productive to society. Put money in a bank, the bank lends it out, the money serves society buy financing a new business or perhaps consumption but either way it is doing something. Lend it to the government in the form of bonds and they'll spend it on something.
If it just goes into the cash account you're describing, it does nothing but exist, in the event of recessions this would be severely dangerous to a countries financial system because it would be the safest place to store your money, safer even than bonds, so at the exact time when the economy needs cheap credit, interest rates would rise as money drains into these electronic cash accounts.
If it just goes into the cash account you're describing, it does nothing but exist, in the event of recessions this would be severely dangerous to a countries financial system because it would be the safest place to store your money, safer even than bonds, so at the exact time when the economy needs cheap credit, interest rates would rise as money drains into these electronic cash accounts.