I think that's the presenter's responsibility. I use the presenter notes to organize my thoughts. By the time I give a talk, I already have most things memorized and only need to grab a few phrases here and there from my (rather detailed full-sentence) notes. The notes easily stand on their own.
It's certainly an improvement over the usual ineffective way people make slides and give talks: by reading bullet points off the slides themselves. I keep over 90% of the text for my talks in the presenter notes. It's equally useful for prepration and for future reference.
