I think central governments are hooked on QE in various forms. The risk of allowing economy to settle back to its unaided trajectory is too great. At least with QE there is a demonstrable positive effect on prices of other asset classes, namely equities. Savers should be incentivised to invest in stock market rather than holding cash.

Savers don't need central bank incentives to invest in profitable companies that provide products or services with real value, that you would buy with your own money.

Fixing the price of money to make up for poor government policy means the incentives are wrong in the first place.