They do link the default configuration for "safe": https://wicg.github.io/sanitizer-api/#built-in-safe-default-...

But I agree, my default approach has usually been to only use innerText if it has untrusted content:

So if their demo is this:

    container.SetHTML(`<h1>Hello, {name}</h1>`);

    let greetingHeader = container.CreateElement("h1");
    greetingHeader.innerText = `Hello, {name}`;

What if I wanted an <h2>?

Edit: I don't mean this flippantly. If I want to render, say, my blog entry on your site, will I need to select every markup element from a dropdown list of custom elements that only accept text a la Wordpress?