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Paul, what Mark is saying, is that they are all capable of producing similar results, and of course they must be well collimated.
There is more involved in collimation with certain designs, and there is those that say that the RC can not be "Properly" aligned and so suffer a little loss. Either way, the results are in the final image, and as can be seen they are still capable of some great images.
Truly sharp image is just not going to happen if your seeing is always worse than the scopes ability. I dont see anywhere where a star in an images is only 9 microns wide. Add seeing, and the star is now 30 plus microns. So why piddle with either 9 micron, or 2 micron stars, as they will balloon up due to the current atmoshepic conditions.
This is just a rough example, you really need to see what it all means when put to practical use.
If you decide to put your telescope in a remote site with great seeing conditions, then what you say is going to have some impact.
Theo
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