I very much agree with you and absolutely wish people did take the time to create their own articles as well as make sure what they write is articulated well and researched deeply enough to ensure accuracy.
That being said, it is nice to see all view points even from those who do not have English as their primary language. Also from those who did not have the chance to complete school. I like to hear from everyone even when they have trouble relating what they are thinking.
Plagiarism is simply nasty, but re-posting articles from other sites with a link to the source seems to fill a very nice gap in assuring Steemit contains a very large set of all that is going on in the world --- all in one place.
Just my two cents (or 25)
Craig