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This is definitely true when it comes to Avics with the whole humidity deal. Which is odd when you consider the fact that Avics seem to require less humidity/moisture than a lot of other arboreals, and even seem to benefit from less of it. The only arboreal genus I've found that seem to require a bit more attention when it comes to these two things is Lampropelma. I have read that these do best when kept with moist substrate, otherwise they are prone to molting issues. I once lost a Singapore Blue sling as a result of keeping it too dry. Most arboreals are pretty easy to keep though, I have found Psalmopoeus and Poecilotheria to be some of the tougher ones.