This statement intrigued me. Without getting into what is fashion and progress (because I am NOT a designer), I was curious what is "too much" contrast. There's lots of literature out there about applying too much contrast in image/photo elements. But here, we're talking about text, and this honestly piqued my interest. Too little is usually pretty obvious. But what is too much? I don't honestly know.
I found the discussion at https://ux.stackexchange.com/questions/123504/maximum-contra... pretty interesting.