Why does that make deflation a good thing?
Because deflation is an increase in the purchasing power of the currency. It isn't any more complex than that. Why do you continue to reject that a dollar growing in value is a bad thing?
I suspect it's because the only deflation you've witnessed in your lifetime is the wrenching kind caused by government price-fixing of the interest rate. A free market wouldn't see that.
And?
Why do you continue to reject that a dollar growing in value is a bad thing?
I don't reject the idea that deflation is a bad thing. Because it hurts investment, reduces employment, increases loan defaults, reduces borrowing and shrinks business creation.