Epistemic status: around that of Descartes' (low)
I am not a native English speaker. Despite that, I've had my English skills in high regard most of my life. It was the language of my studies at the university. Although I still make plenty of mistakes, I want to assure you I am capable of reading academic texts.
That being said: a whole lot of posts and comments here do feel like academic texts. The most basic/heuristic check: I found a tool to measure linguistic complexity, here https://textinspector.com/ - so you can play with it yourself, if you'd like to. Now, I realize that AI Safety is a complicated, professional topic with a lot of jargon. Hence, let's take a discussion that, I believe, should be especially welcoming to non-professionals: https://forum.effectivealtruism.org/posts/kuqgJDPF6nfscSZsZ/thread-for-discussing-bostrom-s-email-and-apology
I could make some Python project and analyse lingustic complexity of a whole range of posts, produce graphs and it sure would be fun and much better, but I am a lazy person and I just want to show you the idea. I mean to sound extremely simple when I say the following.
There's a whole lot of syllables right there.
Most of the comments here do feel like academic papers. Reading them is a really taxing exercise. In fact, I usually just stray from it. Whether it's my shit attention span or people on a global scale are not proficient English speakers, it is my firm belief that ideas should be communicated in an understandable matter when posssible. That is, most of people should be able to understand them. If you want to increase diveristy and be more inclusive, well, I think that's one really good way at attempting so.
This is also the reason for the exact title of the post, rather than "Linguistic preferences of some effective altruists seem to be impacted by a tendency to overly intellectualize."
I wanted to push back on this because most commenters seem to agree with you. I disagree that the writing style on the EA forum, on a whole, is bad. Of course, some people here are not the best writers and their writing isn't always that easy to parse. Some would definitely benefit from trying to make their writing easier to understand.
For context, I'm also a non-native English speaker and during high school, my performance in English (and other languages) was fairly mediocre.
But as a whole, I think there are few posts and comments that are overly complex. In fact, I personally really like the nuanced writing style of most content on the EA forum. Also, criticizing the tendency to "overly intellectualize" seems a bit dangerous to me. I'm afraid that if you go down this route you shut down discussions on complex issues and risk creating a more Twitter-like culture of shoehorning complex topics into simplistic tidbits. I'm sure this is not what you want but I worry that this will be an unintended side effect. (FWIW, in the example thread you give, no comment seemed overly complex to me.)
Of course, in the end, this is just my impression and different people have different preferences. It's probably not possible to satisfy everyone.