Earlier quoted context omitted.
Discouraging savings is actually the point. We should tax money that sits idle and provides tax benefits to money invested. If you can build wealth around being active rather than just reaping the benefit of interest of interests then that should be encouraged rather than just grabbing and keeping.
Money in a savings account is money invested.
Only in the most inefficient way possible. The 'problem' is banks are limited in what they can do with this money which ends up creating investment bubbles and other market distortions which hurt the economy overall. If you slowly transitioned banks so they could not invest this money over say 100 years the net result would not be harmful.
In the end money is not actual wealth, it's simply a representation of wealth. Anything that turns money into more money needs an intermediary where some cash flow is generated. And those intermediary's are often harmful see in excess like pay day loans.