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I've been pondering this post for a bit, and suspect the elephant in the room, i.e. self guiding (read SBIG) cameras, has been missed.
Certainly with early series cameras, guide star attenuation by the filter wheel has been problematic, but this has been long resolved by the guider now being integrated into the CFW. The beauty of the system is however, whatever perturbs the guide sensor, also affects the imaging sensor by exactly the same amount. I routinely do 30 minute subs with zero elongation and absolutely perfect star profiles.
It really is just plug and play, with fewer cables and zero concerns about differential flexure, plus the ability seamlessly add Adaptive Optics using the integrated guide chip.
On the odd occasion I have also gone back to using a separate guidescope only to discover how clumsy the system becomes. Self-guide is a no brainer IMHO.
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