Maybe it's juts me but IMO flocking offers no detectable advantage to the user, mostly it is good for the person selling the flocking material. I have looked through more than one SCT flocked with every imaginable material and I have never seen any difference. If anybody has seen an objective test with a measurable increase in contrast for astronomical use please share it with us. A photo of tube glare in daylight is not proof of anything useful for visual or photographic astronomical use. Why do people do this?
Correct, but I like using it as spotting scope and the difference is very obvious in the daytime. At night with a few street lights around a dew shield will be sufficient.