I personally don't like LaTeX for documentation because it doesn't benefit much from advanced features of LaTeX, while being more difficult to read/write than Markdown.
Discord is great for building a community because it's the defacto chat service for communities. It replaced IRC and does that quite well. Having a place to casually chat with people more invested in the project has its advantages.
Now I really dislike it if they think discord can replace a wiki. Iirc discord added a wiki-like feature a while ago and it's terrible because it's not indexable by search engines.