Ah, ok, that makes the feature useful now. </sarcasm>

That's not the thing that makes the feature useful. The thing that makes it useful is that it makes it easier to do common tasks.

It makes the feature useful if you only use your web browser. If you use a variety of applications on your computer in combination with each other, it’s also useful that they follow certain consistent UI design patterns so you don’t have to learn and remember how each different application works. That’s part of what makes PCs so much more powerful than the sum of the individual programs you run on them.