There might be some pain along the way, but long term we would flourish.

The economic system we have built for ourselves is why it would bring pain. Our economy is based upon debt on top of debt on top of debt.

The economy can never pay down that debt, so we must borrow more to keep the system from collapsing, from the government currency becoming worthless.

If we had 0% inflation, there would be no incentive for people to keep borrowing since the secret about loans is that something worth $100 today is worth $150 next year, so borrowing $100 now and paying back $105 next year is a bargain rather than saving up and spending less than you earn.

This leads to a spiral, and a depression, but it isn't the 0% that caused it, and once the bandaid is ripped, human flourishing can begin on a better foundation.