You can call out to JS using ports and custom elements and accomplish nearly everything you could possibly need. This blog post is focusing on a largely undocumented, always discouraged "feature" (used loosely, as even from its inception it was verboten, couldn't be distributed via the official package manager, etc.) which allowed users to hack library support directly into the Elm language while risking (and losing!) many of the guarantees Elm provides. Whether it's a good fit for your startup is another question, but I just wanted to assuage that concern.