Neither of these are armies that traditionally excel at direct AROs or in the case of ISS, the standard defensive fireteam. What they both do excel at is indirect area control and pressure. In vanilla YJ, you get Kuang Shi and Shaolin Monks to guard your DZ and push up the table with chain rifles (and when well deployed, the monk's smoke will protect him and a kuang shi), and you have tools like Madtraps, Libertos, and Guilangs to control the middle of the table. The best direct ARO in vanilla YJ is probably Lunah or maybe the Yan Huo Neurocinetics missile, and both of these pieces have no response to smoke. ISS is the same but even more pronounced. AVA8 Kuang Shi (as well as Kuang Shi being linkable) means you'll almost always have a huge pile of Kuang Shi in your DZ, and almost always have a couple of Madtraps from somewhere to guard them. The best direct AROs are maybe the Bao MSR (but then you have a Bao Core and that's not good) or maybe the Wu Ming HRL (and then you have a Wu Ming core, which is good, but a lot of points)? In both cases, YJ and ISS tend to play the reactive turn by hiding, controlling the table indirectly, and giving the enemy tons of models it needs to run through to actually make a dent in their order count.