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RSS wasn't on the roadmap.
No-one had ever asked, none of the testing ever revealed the need, the few people I had asked proclaimed that they didn't use RSS any longer, and the feed stats showed only 70~ people out of 40,000 had ever set up an RSS subscription. Additionally, in the 6 months of running test.lfgss.com and the several weeks of running go.lfgss.com not one person made a request for it.
It's not impossible to add though, we'd just put a layer on top of the existing API to render RSS from the API data. It's not going to be a priority for a while though, lots of other things will trump RSS on the list of priorities for a long while.
So yes... using a Follow is presently the best way.
Will there be RSS? I had a subscription to https://www.lfgss.com/external.php?type=RSS2&forumids=61 so that I could see in my feed reader when new project threads started, would be nice to get it back. I'm guessing if I just 'follow' the CP Forum my 'following' is going to get filled up with everything in that forum, which is the last thing I want.