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Put simply Strehl is useful as a cover-all. How many amateurs comprehend was RMS and Peak to Valley measurements mean? The benefit of Strehl has been amply justified by a few manufacturers due to the simplification of highlighting the preciosion of the finished product to the potential buyer. Mirror makers seem to refer to use wave figures, lens makers seem to prefer Strehl.
If Brian has an issue with the entity he is accusing vaguely, I suggest he call them on the phone or email them to discuss.
As I mentioned in one of my mod deleted posts, Takahashi scopes are diffraction limited. I think you will find Tak QA almost guarantees no scope elaves the factory unless meeting this standard. Of course, once such a DL scope leaves the factory, it is now a SEEING LIMITED optic.
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