A living soil deserves a living mulch.
I just don't see a lot of bark and rock around plants out in nature. Mostly a progressive compost. It's worked well for a long time without deficiencies.
C'mon, not a lot of bark and rock around plants in nature. Let's not start grasping at straws in our attempt to discount others' methods of mulching.
This thread has taken on a life of its own, but I know organic soil and I can do it well and it's a fact that even "non-living" mulch is highly beneficial. The purpose, in my garden, is to keep the top few inches of soil from drying out, since the top few inches is where 80% of the biota in the soil live, and since the top layer of soil tends to crust when allowed to dry, and thus becomes more difficult to water thoroughly.
There are other methods and other valid reasons to mulch, but let's not be rude to each other over something so simple.