This is one of the biggest mistakes of this article. Every interface has its use cases. In 90% of cases, I'm setting up a timer via voice "Hey Siri..." meanwhile I'm scrolling the social apps with my finger. And guess what? It could be a native app as well as a web app. Touch is one of our senses. It has great importance to people. We have it in our nature.
Voice could be annoying, especially in noisy or even silent environment. Often you have to say long command instead of a small move and a click or touch.
And always when you use your finger with your device, it's because it is a native app or web app.