I don't think it matters. If you want the plant to attach itself to the mount then yes, you need to create contact points, especially on the new pseudobulbs. Otherwise just make sure the plant gets wet everyday and that it has opportunity to dry out. Otherwise it will still rot. So your conditions will dictate how much moss you use.
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"We must not look at goblin men,
We must not buy their fruits:
Who knows upon what soil they fed
Their hungry thirsty roots?"
Goblin Market
by Christina Georgina Rossetti
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