We have loads of moss in our garden and grass (Oregon). I often wondered the same question. Usually when I'm removing it from my flower beds. I have yet to see any positive benefit to this kind of moss in flower beds.
" I had over 40 active beneficial insect nests in an ordinary block of wood, last year. However, a woodpecker thought these wood make a delightful meal for himself, and his friends!...and ate them all. THIS year (2015), I am…"
"Its latest activity that is too limiting. I just added a fountain last year for my birthday and the grandkids love to play in it. Other than that, the deck is so surrounded by pots theres just enough room for chairs and a small table. I also want to…"