****I am by no means an expert**** but I have some of my phals just in moss & I am in South Florida. I watch my orchids that live in moss very carefully to be certain I do not over water. In Florida, it is mostly humid 70%+, so I may water once a week - at most twice - during the high humid days of summer, it just depends. I can only imagine, but in Az being it is so very dry & very hot in summer, moss wouldn't be as much a problem.
Those top roots which are dead, if you are sure all else is ok, you could wait until time to repot to cut them out. But that is just my 2cents There are phal experts here who know better than I.
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