Can't believe I'm letting myself get sucked into this discussion, but-
There's probably some truth to XIV 1.0 failing due to trying to emulate some elements from XI, but in my humble opinion, that was far from the cause of the downfall of XIV 1.0. Yes, I see the documentary, I see what they're saying, and it is a sound explanation, but I can't help but feel like that's not the whole story either.
As someone who has played XIV from the start of 1.0 and spent time playing XI prior: there were actually very little similarities I could find between XI and XIV; I remember initially being disappointed by that realization. The only few things I recall of XIV 1.0 seemingly carrying over from XI were the races being basically spiritual successors of XI's (down to having no playable male MithrasMiqote or playable female GalkasRoegadyns), most of the same crafting classes (bonecraft seemingly got replaced by armorer), some monsters being updated models of XI's and... Really, that was all I saw...
I don't ever really recall anybody complaining about the game "trying to emulate" FFXI. Heck, there were no classic "jobs" to speak of that the franchise was known for until Yoshi-P took the reins. For the longest time there were no mounts, not even chocobos for the players. XIV 1.0 even tried to go out of its way to do a physical level for characters separate from each level of their classes. They were trying to flaunt Guildleves the same way they flaunted FATEs for ARR's release.
As far as I could tell, the actual criticisms I saw of XIV 1.0 were nothing that was borrowed from XI. The most prevalent complaints that I recall were as follows:And that's only just what I recall right now; I know there was more. If you ask me, the game failed more because it was a glorified beta test/ incomplete game that they thought they could just patch the problems away eventually and a mish-mash of half-baked ideas, not because they decided they could emulate XI and have instant-success. Heck, I think if they even put effort into emulating even some things that worked for XI I'm willing to bet less people would have ragged on it.