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A hypothetical question to perhaps lend some context....
What is the first thing that comes in to your mind when you hear the words; Riccardi Honders...
I'll bet London to a brick that it would be something along the lines of; 'ultimate imaging tool... want.. might consider trading internal organ to acquire'
Now consider the effect of its 50% central obstruction and what level of spherical aberration
constitutes an equivalent offence to the PSF. fwiw) It is waaaaaaay more than 1/4wl of SA.
ergo.. for prime focus deep sky imaging, the only purpose that 1/10th wave optics serve is to gratify your ego.
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