| Is there not a problem here: PostScript fonts may only come in one
| size, which then is rescaled.
| But in correct typesetting, as in TeX fonts, the weights and
| proportions | actually change with the font size.
| So how does that work out here?
the same way as in the rest of the world: by ignoring it.
if somebody makes a PostScript font for a variety of design sizes, TeX
can accomodate it. most PostScript fonts come in one size fits all,
which TeX also can handle.
there is no problem here.