I've never heard of live moss overtaking and orchid, but perhaps if the orchid is a micro-mini type it would; I suppose anything is possible, which I find truer with orchids than any other plant! And you are right - there is a post here showing container growing - Semi-hydro, I think - that someone has posted pics of their container with a lot of moss growing in it.
As far as pro/cons of live vs. dried moss - Looks are a definite pro in my book - the green surface really sets off the looks of the plant that is growing in it; there may be some symbiotic relationship in nature between some mosses and some orchids - perhaps the moss gives off sugars as a waste that the orchid uses - don't really know, but again, anything is possible in this hobby. But for the plants grown commercially the moss is not necessary, that I know of. The grower that I purchased my Sophronitis from stated he always induces live moss to grow on his pots, but he really did not state why. From what I've read, in nature you never find Sophronitis growing without moss at it's roots, but then they have to have a lot of air movement, so the moss acts like a moisture barrier in that environment. I killed the moss on mine immediately and the plants are doing great, so it obviously it isn't that necessary to their survival in home culture.
Interesting question - I like the looks of the moss, but there will be others that have varying opinions - that is a given in orchid culture! It will be interesting to hear what others think.
Thanks for posting the question -
Steve
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