I think one of the most important "features" of Gleam is that it intentionally has a small footprint. I agree with your main point here: that Gleam is highly discoverable. You arrive at this conclusion via "reading someone else's code", which I agree with, but I think there's a second important piece regarding discoverability as well: you can read the standard library and be fairly confident that there aren't hidden "better ways" of doing things. I really like Elixir's standard library documentation too, there are numerous examples of how to actually use each function, which is really helpful for beginners.
As an aside, I really love the citations in the third column of your website. Super cool!