I guess about the worst that could happen would be that on some servers where particular newsgroups existed, but weren't receiving any articles, you might see a few articles start trickling in as a result of this. Many good questions that would have to be answered if you tried to feed these. I'm going to add language saying they can not be fed. If someone wants to tackle this it can be a future extension. These issues should be addressed in the draft.
TEXT is all indexed text in the article.
This command is unnecessary. I'm not sure we should though. I would like to be able to inform the user in advance whether they are wasting their time building up a search. And putting the flag on each group isn't going to help here, since I want to specify search across very large hierachies. Similarly, I want people to know what character set to send, if the server cares.