To be honest, I'd just start with a global feed with only the posts. Ignore comment feeds since it's easier to follow them directly from Disqus. If we see the need for a per tag feed, we can work on it but yes it does add extra computation that we should avoid.

+1 My thinking as well. Even though the pages per tag and author get generated it would be a but of fiddling to set up feed generation for each of them, whereas for the global feed the standard Atomizer extension will work. I have the global feed generated, but there are some other things which needs adjusting. For example, the publish date is for some reason 7 April 2015 22:47 for all of them.