Okay well it seems like I'm a bit late to the discussion party. Hopefully my opinion is worth something. Heads up: I live in Columbus Ohio and am one of the organizers of the local LW meetup. I've been friends with Gleb since before he started InIn. I volunteer with Intentional Insights in a bunch of different ways and used to be on the board of directors. I am very likely biased, and while I'm trying to be as fair as possible here you may want to adjust my opinion in light of the obvious factors.

So yeah. This has been the big question about Intentional Insights for its entire existence. In my head I call it "the purity argument". Should "rationality" try to stay pure by avoiding things like listicles or the phrase "science shows"? Or is it better to create a bridge of content that will move people along the path stochastically even if the content that's nearest them is only marginally better than swill? (<-- That's me trying not to be biased. I don't like everything we've made, but when I'm not trying to counteract my likely biases I do think a lot of it is pretty good.)

Here's my take on it: I don't know. Like query, I don't pretend to be confident one way or the other. I'm not as scared of "horrific long-term negative impact", however. Probably the biggest reason why is that rationality is already tainted! If we back off of the sacred word, I think we can see that the act of improving-how-we-think exists in academia more broadly, self-help, and religion. LessWrong is but a single school (so to speak) of a practice which is at least as old as philosophy.

Now, I think that LW style rationality is superior than other attempts at flailing at rationality. I think the epistemology here is cleaner than most academic stuff and is at least as helpful as general self-help (again: probably biased; YMMV). But if the fear is that Intentional Insights is going to spoil the broth, I'd say that you should be aware that things like https://www.stephencovey.com/7habits/7habits.php already exist. As Gleb has mentioned elsewhere on the thread, InIn doesn't even use the "rationality" label. I'd argue that the worst thin InIn does to pollute the LW meme-pool is that there are links and references to LW (and plenty of other sources, too).

In other words, I think at worst* InIn is basically just another lame self-help thing that tells people what they want to hear and doesn't actually improve their cognition (a.k.a. the majority of self-help). At best, InIn will out-compete similar things and serve as a funnel which pulls people along the path of rationality, ultimately making the world a nicer, more sane place. Most of my work with InIn has been for personal gain; I'm not a strong believer that it will succeed. What I do think, though, is that there's enough space in the world for the attempt, the goal of raising the sanity waterline is a good one, and rationalists should support the attempt, even if they aren't confident in success, instead of getting swept up in the typical-mind fallacy and ingroup/outgroup and purity biases.

* - Okay, it's not the worst-case scenario. The worst-case scenario is that the presence of InIn aggravates the lords of the matrix into torturing infinite copies of all possible minds for eternity outside of time. :P

(EDIT: If you want more evidence that rationality is already a polluted activity, consider the way in which so many people pattern-match LW as a phyg.)