Well, define "bad." It's bad if you want long hair - the quickest way to get long hair is simply to not cut it - at all. That being said, however, sometimes a trim is the best idea, such as when growing out a super-short pixie and you need to de-mulletize to preserve your sanity, or when growing out damage and the ends look just awful. But if you have a healthy head of un-dyed, un-heat-styled, carefully treated hair, there's really no reason to trim, IMO.
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