I'm curious how Disqus does "Adapts to your site's look and feel". I've never paid attention to Disqus changing its color automatically. Maybe they just mean their background is transparent and they detect light vs dark 😁
The only thing my extension doesn't do that's listed here is automatically using the webpage's color theme. I'd argue this is easily adjusted via custom CSS if needed.
It might be worth noting that Disqus also uses an iframe. Only difference with my extension is that they add the iframe via javascript, whereas I insert it directly in the Wordpress template.
Unlike Disqus I made the choice to show an iframe border so users easily identify which part is scrollable. I experimented with auto-adjusting iframe height but it doesn't work well with Flarum, so I have been forced to continue with fixed-height iframes for now. The border can be hidden.