i very much disagree. i hear a quite noticeable difference between say a2 and a5. even uoa5 and a2. does the difference matter to an audience? of course not, but its enough for me to swap back to what i like.I find the difference between A2 , A4 & A5 to be subtle at best
Even between ceramic and alnico is very slight
In a mix all of the differences disappear
Or an adjustment to the tone control will do that