have you ever tried E12 normal with healers that don't know how Stock works and no DPSes that can combat raise?
Also that same argument can be used to take echo out of normal trials, but there it's even stronger than in EX trials.
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I'd rather they keep Echo away from NRs except maybe after 2nd wipe or so.
Floors with awesome BGM like e8n final phase don't even get to play up to its chorus nowadays.