I have trimmed roots before, but have not noticed it helping or hurting, as much as I have noticed good media promote growth.
Like I previously said, how you grow, were you grow, will dictate on what medium you use. I know lots of growers that use pine bark, but most of them grow under plastic (generally commercial growers) and they don't have to deal with rain.
Another thing that is imperative, is making sure the rhizome is pinned down firmly with a clip. Any movement of the plant, and it will stop root growth.
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