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There are good arguments to be made against Drexler and Bostrom's respective visions. Credentialism & trying to divide people into "scientists" and "non" is, unfortunately, an extremely weak argument.
Michio Kaku is a "scientist" but most of his ideas are fanciful fictions. Thought experiments are absolutely critical to conjuring hypotheses but "scientists" qualify and temper hypotheses and are not sensationalist alarmist or aggrandizing without evidence
I've been a full-time research scientist almost my whole career. Productive scientists are all over the map in comfort with speculation. I. J. Good was an excellent scientist who was also comfortable with speculation, thus superintelligence (Bostrom is riffing off Good).
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