I think it's because they won't have to watch out for spelling mistakes, and so they find it more easily to write something. But formal writing shouldn't be unattended, but that's what most of the teens do, and so their writing gets worse, and they also use these informal writing in school, because they think that this is formal spelling anyhow, but it isn't. So I really have to agree with your article.
I think this robot is really a great invention. Using it in dangerous situations could really save human lives. So hopefully DORA is soon functionally that no more people will have to do such risky jobs.