I find that with most newsletters I don't really care about what's new or has changed. It's only when I actually need to use X product or do Y thing that I like to know what's new. This makes RSS nice since I can go weeks and then when I need to work on something using a tool I can check the news for that item.
It depends, of course. Some things I appreciate having it sent daily, others I really don't. There isn't a one size fits all solution and that's not a bad thing.
I used to use rss heavily, but it has been many years since I regularly checked a client. At least with email delivery I don’t miss them.