I follow this approach. It's mostly because I want to own the land I build on.
It works well, but it's hard to automate. In the end you must manually cross-post, and both the post and the discussion will vary by community. You end up being active in multiple different communities and still getting little traffic from the effort.
It's not such a great way to drive traffic. On the other hand, it's a wonderful way to work in public.
> It works well, but it's hard to automate
That's because social media sites have purposefully made it hard (or relatively expensive) to post on their platforms with automated tools - they specifically don't want you to POSSE
Facebook also deprioritises posts with links in them to disincentivize people using their platform to promote their own primary source, that's why there's the "link in comments" crap.