Are they? Font contrast is a multifaceted concept that encompasses not only color but other properties as well. For instance, stroke weight and its modulation, which are inherent to a typeface.
I see. You're clearly knowledgeable in this area and my naively used terminology has misled you. In terms of contrast I'm talking about the simple stuff "Contrast is the difference in luminance..." https://en.wikipedia.org/wiki/Contrast_(vision) whereas you're talking of something typographical I was unaware of. Sorry for the confusion.
To be fair, though, the first comment that referred to contrast was clearly talking only about color, and had nothing to do with "topography contrast."
The original comment was
> Designers love grey on grey. I’ll take comic sans any day.
These are two orthogonal features. It's like saying "fashion today is really into high waists, but I'll take denim any day."
