Just like you'll surely use your oven instead of the microwave if you're not time-constrained because it's a richer taste experience.
So, if I'm time-constrained, you're thinking I'm going to type that email on my iPad? Again, this is a bad analogy. I think people really do need tablets. They just don't need them when their desktop/laptop is in reach.
The preference for the microwave is only when you're time-constrained. Otherwise the oven is preferable because of the tastier results it produces.