I think the statement "A Scanner Darkly is certainly one of the first major dystopian sci-fi works" needs some qualification. There were major dystopian sci-fi

I think the statement "A Scanner Darkly is certainly one of the first major dystopian sci-fi works" needs some qualification. There were major dystopian sci-fi works dating at least back to the previous century. The Island of Dr. Moreau by HG Wells comes to mind.