Yes,can be an issue, but if one is providing various feeds (RSS, Atom, JSON, or h-feed) of various post types, then it becomes easier to slice and dice the content coming out of particular websites. I’ve got my website set up so that nearly every post format, post kind, category, and tag has its own feed. Ideally, you should be able to extract almost anything you’d want from my site via a custom feed if necessary.
Separately, I maintain a following page which, similar to a blogroll, is a list of sites I’m following along with OPML of the full list or subcategories. Thus if you want to subscribe to the IndieWeb OPML list, it’s there for you. (Even more fun if you’re using functionality like OPML subscriptions as they’re done in Inoreader, so that when I update my list, yours automatically does too.)
If you’re interested in recreating portions of some of this I’ve tried to document a lot of it (for WordPress at least) at https://boffosocko.com/research/indieweb/.