These links are useful even if they don't have a discussion:
1. It's interesting to see that a story has been submitted many times, for instance. This can be seen by clicking on the domain name in brackets after the story
E.g., a few days ago I posted a link to Heidi Howard & Ittai Abraham's 'Raft does not Guarantee Liveness in the face of Network Faults'
It was the fourth time this 6-month-old link had been posted, each time attracting upvotes but not enough to get on the front page. (I think it usually takes about five upvotes for a story still on the first page of 'new').
https://news.ycombinator.com/from?site=decentralizedthoughts...
2. Given that your newsletter mostly contains links that are less than a week old, the discussion link will still be live. You seem to think discussion is most likely to happen on a resubmitted link: I'm guessing your newsletter's readership is unlikely to be large enough to get the regular kind of front-page HN discussion going for many of the stories in your newsletter, but the opportunity to comment can still have value even if only a couple of comments are posted.
3. If a story is well-written, I generally like to glance at other things the author has written, and looking at stories that have been upvoted here on HN is often a good place to start.