Does it have to be anything but an old ruin? The idea of the temples being of ancient Sith origin (indirectly) was one of those things that was around for so long in the old EU that people didn't think of it as anything odd, but it does sort of feel that way when you just look at the movies alone. Although I have a feeling they're not going to change it, actually.
That's exactly why I mentioned it. It wasn't supposed to have anything to do with the Jedi or Sith and it would be interesting if the new canon went back to that.
The Yavin temples being Sith is one of these things that make events feel contrived and the galaxy feel unnecessary small. Then again, TCW had the main characters visiting every single planet in the saga, even in they were remote places like Mustafar or Dagobah, so it's not like that was an EU thing or something we're not going to see in the new canon...
I liked it. It was suggestive of just how widespread Sith dominance was, a hint of ancient, forgotten history like the Balrog in the Mines of Moria in LOTR. Furthermore, it made sense from an IU perspective. My headcanon was always that Luke was hidden on Tatooine because Vader would never return to a world with so much memory for him, Yoda hid on Dagobah for its dark side cave that would mask his light from detection, and that Yavin IV was chosen for the rebels precisely for its Sith temples, which would prevent Vader and the Inquisitors from finding it through the Force much like Dagobah.
I have a natural aversion towards "Luke was hidden in _______ because Vader would never go there because of ______" theories. I thought it was ludicrous even back in the 90s, when I first read the novel. "What are the odds, man?" I got used to it. Then I faced the one-armed wampa in Darksaber and realized that was just the way KJA's mind worked.
See I read the whole thing differently... as if the temple had been converted and was 'swallowed' by new buildings... Oh, what are you guys doing here... Sith stuff...
darklordoftech As for why they didn't visit, I'm fond of the concepts of lost knowledge, and truly ancient, forgotten evil. I prefer to keep the New Sith and ancient Sith entirely separate, and I don't believe Palpatine or Vader would have had any knowledge of Yavin, nor indeed of pre-Ruin Sith history.
Oh, I'm not denying that in Legends canon, Palpatine knew all about pre-Ruin Sith history. Heck, Plagueis was well educated on Vitiate. Overall, 'modern' Dark Lords' knowledge of their ancient history is about as consistently portrayed as the average citizen's awareness of the Sith, which is to say not very. But my interpretation, and one I hope they take in the new canon, was that the bas relief was closer to 2,000 years old, not 5,000. 5,000 years, even the 4,000 of Exar Kun, is a very, very long time in the past, and TOTJ (as well as the Jedi Academy trilogy, for that matter) made that apparent.
But where would he get the lava from? Shipments from Mustafar, I guess. I like to think there was such a throne room beneath the Sith Citadel on Ziost, used by all the Dark Lords of the ancient Sith. It'd make sense for a planet of ice and eternal night (a shame the latter description was dropped), a planet surely otherwise uninhabitable, to be warmed by subterranean lava lakes and rivers.