Not sure I agree with the point you mention regarding it being a bad
move for desktop computers as Hel Neue is not even a core font for
most OSs. While I'm not sure about the other mobile devices, iPhone
does not require something like "media=handheld". The issue is that I
would think most would agree that the default behavior should be to
italicize <em> almost as a default, yet the base stack calls a font
which iPhone has an issue with. Understanding the iPhone continues to
gain marketshare, it seemed a good move to consider a change to the
stack. That's all.
It's not obviously, not an issue to override BP, I was only pointing
out something that seemed very basic and could possibly have a quick
solution.