But it's terrible for search, both internal and external(Google).
Why ?
Let's start with internal search. Ctrl-f fails in thread search. No other mechanism to search inside a thread.
And about external search:
Permalinks to individual comments - great for the search engine when you request a very specific thing - a specific niche comment from this site could get ranked highly in google.
Also, it's making it easy to link to a great comment is import. Impossible here.
Permalinks to webpages that contain full threads - lots of relevant text for the search engine to chew on. But in flarum the content lazily loads. So maybe Google wouldn't be able to chew on all the comments.
And the fact that when Google finds a thread from the site, he doesn't say how many comments per thread , indicates that he doesn't see this as a forum, which could be bad
And all this is a real shame - it's a community with really valuable content.