Well, you are right, that a lot of the bad things mentioned won't happen due to 2-3% of deflation.
But you still haven't rebuffed my original a priori argument: that government golden standard inhibits rather than helps business growth, and I don't see a manageable option, how government is going to regulate the influx of new money into the system, if you do accept the premise, that it should actually do it. What would the methodology be? Moreover, I don't see things quite the same way you do:
money gaining value -> people spend less, postponing sales till prices drop even more -> people spend less, business earning less -> business growing less, buying less services from other business -> the whole business market if not shrinks, but experiences a certain retardation of development -> people invest less, since the whole market seems to be slowing down and the profitability falls.
Just because GDP grew during golden standard era, doesn't mean, that it wouldn't have grown 2-3 times faster without it. We just don't know.
Inflation... Inflation is an interesting concept. Currently its being used as a tax on savings. Invest/buy or loose value. 100% collectability. Very efficient. Not very moral, but it does work as a sort of whip to force people to do something with the money, rather than keep it in a box.