A skill or two? Like pom, br, healing skill, debuffing, 100% res, level 2 harmony, level 5 buffs, and handful of other including class specific buffs of the sws and bd that stack on pom.
The ISS is fine, it's a support class, it's not going to become a DD, self buffs are not good enough to replace a boxed ISS or buff pots from store, which if you wanna claim a decline in work availability for ISS mains is because of boxes and pots in pve.