Actually, I *was* talking about purely typographic/aesthetic
ligatures as well. I'm aware that which di-/trigraphs need to be
considered from a font design perspective is language-dependent.
But the point is that I observe that:
(a) aesthetic ligatures are not frequently seen in modern German
print and
I would assume that is because many commonly used fonts are designed
in such a way that letter glyphs don't overlap anyway.
That's the impression I get - all {fl/fi}'s in the dozen or so German
books I've just checked look perfectly fine to me :-)
And then you should not use any ligature. (Sorry if my original
"should" implied otherwise.)
Oh, well, then it looks like we agree. I guess it's at least an
interesting observation that they've found a workaround in some locales.
Just as it will please typographers that ligatures are seemingly making
a comeback everywhere, now that we've left the typewriter age. (And that
ill-designed ligatures - possibly standing out more than their absence -
have biased and corrupted my perception of the subject matter.)
- S