Is there's really a point to SCH's Chain follow-up to be a DoT, assuming it's going to fall off before we're able to use it again?

I've always thought DoTs are barely different from having another attack with a CD if they can't be reapplied earlier than when it falls off. Isn't that why they removed NIN's going into EW? I guess there's some stuff revolving gearing and buff interactions, but that makes it even sillier to me since it won't snapshot Chain's crit buff.

IMO they only really add depth to a kit if they're something you have to think about refreshing correctly as opposed to more or less being a button to press when it's ready.