And it's been 9 years since we got a Scouting job,
which remains the only sub-role with only a single job therein.
Moreover, is recency really worth making the primary criteria here?
I mean, let's look at the job distributions for each expansion:
(Bold marks the roles most recently added to.)
(Underlines mark roles with relative job-scarcity.)
- ARR: 2 tanks, 2 healers, 3 melee, 3 ranged
- HW: 3 tanks, 3 healers, 3 melee, 4 ranged
- StB: 3 tanks, 3 healers, 4 melee, 5 ranged
- ShB: 4 tanks, 3 healers, 4 melee, 6 ranged
- EW: 4 tanks, 4 healers, 5 melee, 6 ranged
Sure, melee and healers were added to most recently, but only because they were the roles with the fewest options compared to their intended slots. You'd still have to add 1 more just to reach a balance point.
I could see why we'd want Role X to be the last to get another job
if the distribution were already balanced,
but it isn't; we're still 1 melee short of even that.
Given that there's only one role and sub-role each (Scouting, within Melee) that have disproportionately few options, it's fine for Scouting to be among the jobs added to next expansion.