From my experience the taboos are more based around perception than truth.
There is truth in that you can damage the optical coatings, and I believe on some SCTs assembly and disassembly is more complex than others (and particular care needs to be taken in regards to alignment).
But I also believe some people treat their gear with such kit gloves that if the manufacturers treated them the same they would never even make it out of the factory.
In short in all things be practical. They are a made device, and so someone with reasonable care (and reasonable intelligence) should be able to assemble, dissassemble, and maintain.
I took my SCT apart and reassembled it a number of times. It was actually a surprisingly simple design, and quite easy to service (it was an older model without the special coatings so there was little risk). Oh and it did improve the optical quality.
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