I had a similar thing happen with a Bulbo and cheap sphag I bought at HD.
I don't think the ferns will hurt the Coelogyne. I let mine grow for a while but ended up yanking it when it got bigger than the bulbo and the bulbo started having some health issues (I don't think they were related). I've had a variety of hitch-hiker plants including moss and clover-like ones. I remove or leave depending on how I think they look. I say, if you like it leave it. At some point, it may get larger than the plant and you can reevaluate then. Of course, the same goes if you see health issues.
Another thought is that all of our plants evolved (or members of their heritage did) in complex ecosystems when they grow along side many other plants including ferns. In those situations, it may benefit the orchid to have surrounding plants removed due to limited resources. However, since we (usually) give the plant ideal or close to ideal conditions, I think this is less of a worry.
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