Earlier quoted context omitted.
(X) doubt Any evidence for that?
The US was on the gold standard from 1882 to 1933. Recessions from that time: * 1882-1885 recession (not totally fair; gold standard policies hadn’t had time to cause this) * 1887-1888 recession * 1890-1891 recession * Panic of 1893 * Panic of 1896 * 1899-1900 recession * 1902-1904 recession * Panic of 1907 * Panic of 1910-1911 * 1913-1914 recession * Post-WW1 recession (1918-1919) * Depression of 1920-1921 * 1923-19…
Also I think saying that inflation was "lower on average" is really a dramatic understatement. From independence up to the advent of the "mixed system" in 01933 (really a switch to fiat currency until 01944) inflation was probably zero on average. The same was observed over the 1300 years of the commodity-backed pound sterling (usually gold, sometimes silver or bimetallic).
I think there are plausible arguments that fiat currencies are less prone to such crises, and even that they stimulate economic growth, but I don't think it's an open-and-shut case.