A last missing link for interoperable representation

[James Kass via Unicode]

Living languages and writing systems evolve.

Using the combining low line to show stress seems reasonable to me, 
perhaps because it was a typewriting convention I'm old enough to 
remember.  People unfamiliar with that convention should be able to 
figure out what's up from the c̲o̲n̲t̲e̲x̲t̲.  Drawing a line under a 
word or a phrase certainly draws attention to it!

(Apparently there's a recently evolved practice to use periods between 
words. To. Add. Emphasis.  Almost as if one is speaking v-e-r-y 
s-l-o-w-l-y in order to make a point.)

End users probably consider the entire Unicode set to be their tool 
kit.  I've seen plain text screen names in both cursive and fraktur, 
thanks to the math alphanumerics.  The carefree user community seems 
unconcerned with the technical insistence that *those* characters should 
only be used in formulae.

If, for example, ������������������ ������������������ can input her 
screen name in cursive, there's nothing stopping me from using 
��������������, if I'm so inclined.

Making recommendations for the post processing of strings containing the 
combining low line strikes me as being outside the scope of Unicode, 
though.  Some users might prefer that such strings be rendered in *bold* 
and other users might prefer /italics/.  This user would prefer that 
combining low line always be rendered as combining low line.