Remember that they'll still be able to bring Goad, Feint (STR+DEX virus), and other utility-based cross-role abilities (as can any other melee job, of course) in addition to their slashing debuff. In Goad's case, Ninja is also losing the distinction of being the sole job that can bring that capability. Hopefully, this just means that the gap between jobs with "high utility" and "low utility" will be somewhat narrowed compared to Heavensward.