I remember that some criticized Vandersteen speakers for being "rolled off" in the highs. To me, I owned three pair of the 2s over the years, they were natural sounding.
But about that time in the '70s there was increased demand for MC cartridges, many of which had a rising high end in their response. So I suspect that increased, sometimes false, sense of detail from a brighter high end became a popular norm. Then any speaker which did not match that characteristic was criticized by many folks.