Smartphone. Think of people in your life who aren't tech workers. When do they use a computer if they don't use one for work? Almost never and when they do it's for specific tasks like create this document, fill in this form, research this destination, book this trip.

There are a lot of people I can think of who would be happier just describing this task to a dot or some other agent rather than digging out a laptop, booting it up, fighting with Windows update etc etc

For those people this could absolutely replace the need for a computer.