Yes, you are that newsfeed suppose to be recording of all the activities around the site. This is the main function. And it also allow to post directly different type of content (text, photo, video). For example, you want to post on your community a funny photo with a short comment, if this function will be disabled, you have to go to photos, press upload photo, choose photo, type description, select album.... too long for a short funny photo :)
With current newsfeed, you can just type some words and attache photo and community members will see. It is easy, fast and effective. That's why Facebook became so popular. You can fast and easy share your content, there are no excess operations :)