Snowy mountain syndrome never being adapted genuinely pisses me off, its right after Disappearance, it works beautifully as an aftermath to it and as a setup for future stories, and is just in general easily in the top 5 stories of the series, not to mention how it would of definitively shown to anime-onlies who bitch about Haruhi being insufferable, how she did indeed genuinely change.
But Endless Eight had to be covered before those stories, because it was imperative that Disappearance was aired before any of the post-Disappearance stories, and Disappearance is heavily reliant upon Endless Eight for it to work, in the LNs Nagato change which eventually led to her creating the alternate world felt a lot like telling, instead of showing, in a very bad way, which is one of the reasons why I consider the anime version of Endless Eight (sans. episodes 3 and 6) to be so good, because it not only made her creating the alternate world into showing, instead of telling, in a good way, its genuinely one of the best examples of show dont tell Ive seen, because it made the audience actually feel themselves what the character is feeling, not just by empathizing with them, but by having them genuinely go through a similar experience, which then makes them naturally wonder what it must be like for her, and causing them to pay attention to her, and how she reacts differently.
Endless Eight has only 1 merit to it, Nagatos story, but it is a damn good merit.