So, actually, since I’m a responsible saver, all this jargon in this article means I should welcome deflation to a certain extent, but extreme deflation would ruin my mortgage investment.
Got it. So really yay no inflation and yay deflation! Finally conditions that pay off for savers!
--or if you've already paid off your mortgage you'll find your wages cut and you'll only be able to sell your house'n'car for half what you paid for it. Same goes for all those gold'n'silver coins you hoarded. Other stuff too --from the article:
The belief that money made tomorrow will be worth less than money today stymies investment; the belief that goods bought tomorrow will be cheaper than goods bought today chokes consumption. Central bankers can no longer set real (that is, inflation-adjusted) interest rates low enough to restore demand. Wages, incomes and tax revenue all stall, undermining the ability of households, businesses and governments to pay their debts—debts which, in real terms, will grow more burdensome under deflation.