It's unmitigated infantilism. Outside of the physically disabled, who would need such a feature? Is touching your phone to make a call less convenient than speaking to it? If touching your phone is so inconvenient, then why do most adults spend hours per day on their phones?

What most of these sorts of features do is not to add convenience; instead they remove the need to exercise impulse control. They reduce "friction," which means you do the action more often. But they don't improve convenience. Convenience is not needing to walk outside to the well to fetch a bucket of water. It's not someone making an app so automatic that you no longer need to use your executive function.