Mithril appears harder to read than equivalent JSX.

const links = ctrl.pages().map(page => <a href={page.url}>{page.title}</a>);

return <div> {links} <button onClick={ctrl.rotate}> Rotate Links </button> </div>;

Compared to

		m("div", [
			ctrl.pages().map(function(page) {
				return m("a", {href: page.url}, page.title);
			}),
			m("button", {onclick: ctrl.rotate}, "Rotate links")
		]);

I can see what the UI will be with JSX at a glance with Mithril I have to parse the code.

edit: Mind you both look awful due to HNs poor formatting ability. Honestly how did this website become so popular with tech people?