SE did say this was just the start of Job Points. I am hoping they will make a new Job Point for RDM that does like 3 more enspell damage per JP, for starters.
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Climactic flourish still only works for the first hit in a WS (or attack round), though. It just lasts for several attack rounds. Not to mention, they are individually nowhere near the power of a sneak attack crit anyway. All the extra damage from a climactic flourish might give a damage boost similar to sneak/trick attack when combined, though, but that's just me guesstimating.