1) Yes, it's the top players getting the top gear who are posting these strategies. But you can still -learn- from them. Learn mob strategies, learn what setups work and what kind of abilities are used as gimmicks. Like the eye in Reisenjima having its air spikes proc'd off by Light-aligned WS, or that the Dullahan uses a powerful AoE magic attack at <50%, so you're going to want a good magic tank or ways to resist magic, etc.
2) You do realize that accessories aren't iLvl, right? iLvl only applies to visible slots. This is also the same situation we saw at 75; we saw plenty of lower-level gear getting use. Level 60 Chiv chain, Level 33 PCC, Level 30 Rajas Ring, Woodsman/Sniper Rings, etc. On the matter of accuracy, what axes are you using? What sets are you TPing in? What augments do you have on your Taeon gear, etc? Players had > 1000 accuracy BEFORE Reisenjima, so it's not just the newest gear. Do you have your weapon merits maxed out? Have you worked on getting Gifts for accuracy? Etc.