Remember the hypothetical "emacs reference card", which must be accompanied by 12 pages of additional invariant material? Sounds like a big deal to me.
If the GPL were used, it would have to be accompanied by 6 pages of additional invariant material. That is still bigger than the reference card. Do you object to the GPL on these grounds? The DFSG lists three specific licenses that are meant to satisfy its criteria. Nowadays some Debian developers tend to say that these three licenses are listed as exceptions to the rules of the DFSG, but I think that is a misinterpretation. I think they are meant as examples to help people understand what the DFSG criteria mean. An interpretation of the rules which would lead to rejecting any of thee licenses is the wrong interpretation.