Deflation of a currency discourages people from spending it, because you can make more money by just holding on to it. It makes loans more expensive to provide because someone can borrow money and it will increase in value without them doing anything, so you have to have higher interest rates to counterbalance this. This harms economies. What you want is stable prices, erring on the side of inflation if you must.

I suppose for a single person deflation doesn't feel like much, but money is collective so the party doesn't last.