multimedia/gst-plugins0.10-{base, good}

[segv%netctl.net@localhost]

Could someone please explain to me why in the Makefiles the following things
are disabled:

# Disable all drivers and features by default.
.for driver in  alsa \
                cdparanoia \
                freetypetest \
                gnome_vfs \
                gst_v4l \
                libvisual \
                ogg \
                oggtest \
                pango \
                theora \
                vorbis \
                vorbistest \
                x \
                xshm \
                xvideo
CONFIGURE_ARGS+=        --disable-${driver}
.endfor

OK I don't understand the functionality of those plugins, but disabling
everything would make the package useless wouldn't it? I mean I need the
plugins to play ogg audio files for example, why disable it?