SharnRee was 100ish wipes I believe over weeks. (Killed after maybe 2 months in turruj)
-Turruj boss warchief or whatever was 60ish wipes for tuning over 2 raids (not 100% on this one but I believe after 6-8 Sharnree kills)
Best I can tell from the sketchy information I gathered (no staff-based knowledge used for this post):
Sharn`ree, Blood's Justice was first killed around June 28th 2011
Warchief(tain) Rujik Moktar was first killed around August 14th 2011
Taeshlin, the Fallen Guardian was first killed around September 16th 2011
Vylast`zara, the False Savior has not been killed. FWF got it to 50% quite a few times, but FWF never got a handle on the mechanics past that point. It seems entirely beyond Tier 13 (and Tier 14), but that could be explained by us failing to understand a mechanic properly or one not working properly. We don't know. It'll take more attempts to know for sure, and I'm not about to put myself on REDACTED status by looking into myself.
... and there's the encounters put in as part of the Jyre questline
Rohk, Traitorous Hand was first killed around September 7th 2011
Blazewind (normal difficulty) was first killed around October 24th 2011
Jyre was first killed around January 18th 2012
Blazewind (hard difficulty) was only attempted a couple of times, so the tuning of the difficulty of hardmode isn't even done. I believe it to be impossible with current gear (even with gear from April), but as anyone that's done brand-new content knows, sometimes a Dev is watching and goes "wow, that's WAY more damage than I thought it'd be" and changes something to make it closer to how they wanted it to be.
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In some of these cases, there was a lag between the time we completed an encounter and the next was created and implemented. In all cases, there was a period of "oops, that mechanic just broke and wiped you. Buff back up while I adjust something and wait for me to say I'm ready for you to try again". There was also plenty of "nope, it worked fine, I'm not CSR rezzing you, so run back, buff up and try again". The fights were all difficult and wiped us a lot.
Even after we beat it, it certainly wasn't "farm status". Even 6-8 months after beating sharnree, rujik, and blazewind, we'd celebrate beating those bosses first attempts. They are difficult beyond just the gear requirement, and surpassing the gear requirement could do only so much to ease the difficulty.
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Now, back to the point at hand, I don't see any reason why Exodus and/or Chaotic Winds would not have the same experience. The gear they are entering these fights with will be a little different than what FWF had, so there will be some amount of adjusting that must be done if they get in decent attempts and get facestomped anyway. At least the mechanics themselves will work as well as they did for FWF. They'll get difficulty-appropriate fights and the same experience had FWF with a little less frustration.