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In the days of film astrophotography that was certainly the wisdom: you don't need 1/8th wave figures to get good astrophotos. That will still apply where there is any sort of long exposure, but the advent of adaptive optics means that the optical performance will become more important. Planetary imaging with a high resolution video certaily shows up defects in the optics, the degradation due to slightly miscollimated optics certainly shows up, and I suspect so would a bad figure.
It all depends on the arc-second per pixel spec of your current imaging system, and your typical exposure length.
regards,
Andrew.
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