Sure it's reasonable. It takes a lot less time to download the Wikipedia than it does to create your own selection of articles that you may, or may not, be interested in. That would be useful for a person who is going to be offline for a period of time, or who doesn't have internet access where they read.

This isn't necessarily a concern for urban and suburban dwellers who can quickly fetch an article on their mobile phone, but there are still plenty of places in the world where the cellular networks are nonexistent.