Re: A plea for dynamically loadable extension modules

[Richard Stallman]

    That doesn't make sense.  Emacs could use the same exception in its
    license that Guile uses.  The fact that the exception is used for
    Guile shows that the FSF does not object to the exception in
    principle.  There may be a specific reason it's not desirable for
    Emacs, but then what is it?

That sort of exception is similar to use of the LGPL.  In most cases
it is a step backwards.  Only in special cases is it indirectly
beneficial.  See http://www.gnu.org/philosophy/why-not-lgpl.html
for an explanation of this issue.