Apple do listen, but like any large corporation of their size, they listen for the sound of significant volumes of public / consumer opinion.
In your example, contacting Apple to say you are unhappy that you cannot highlight text in Pages won't likely get you anywhere. Thats where we come in! Forums are the ideal mechanism to ask questions to a community that is large enough to have the breadth and depth of members (and their knowledge) to solve the problems of individuals, or suggest alternatives, but still being focused on the issues of individual members!
If however, Pages stopped selling from the App Store because a huge number of folks in the world were experiencing the same problem and it was fundamental to their use of the App, then you can be sure Apple would hear that and take action.
There's nothing specific to Apple in that. Microsoft, Google, and every other large consumer focused organisation will act similarly.
Now, back to your post. I hear what you are saying about not having a particular problem, but you did ask about the Pages thing elsewhere in the forum? Unless you just made it up as an example, why not ask the specific question in the right part of the forums and I'm sure you will get some help to understand whether 1) you are doing it wrong, 2) Pages does not support what you want to do, or 3) there is an alternative way to do it which gets you to the same result.
Oh, and don't forget to use our search, just in case your question has been asked and answered in the past!
Good Luck!