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I wouldn't say that at all...they're still mighty effective photon collectors, that hasn't changed.
The CMOS revolution has been coming for years...Sony announced several years back that development (but not production) of their CCD range had ceased, leaving the excellent 674/694 sensors as their last hurrah.
With the CMOS sensors, their primary purpose for production is something else, so we're just benefiting from the economies of scale, which in turn makes them a more accessible entry into astrophotography...which is a Good Thing(tm) IMO.
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