That's the whole reason we have Bard and Machinist though. Archer and 'Gunner' are not enough of an identity on their own to flesh out an entire job. This isn't a single player JRPG where you form a party of separate components, you have one character, one job, to use to tick all the boxes of a complete gameplay experience. This is why WHM does more than just cast Curaga and Holy, and while BLM does more than a single nuke spell in six different elemental alignments.
There's a difference between coming up with a partially formed idea, and coming up with an idea for a partially formed job. There's coming up with a new job identity that you haven't completely thought out, and then there's recycling a small part of an existing job that we already know won't be enough to make up a full job on it's own.
While this topic might not be that, 'Gunner' certainly is.
