I briefly recall that the typesetters really want the math fonts and text
fonts to match. But is this really necessary, as all math symbols and names
should properly be typeset in an graphical environment, separate from the
text environment. For example, the name $\sin$ would have extra space
around it, in order to bring out that this is not proper text. So would not
non-matching text and math fonts rather help bringing out this difference
even more?

  Hans Aberg