I look at webflow as great/fast building block for static web design. As well, base templates/blocks for CMS/Blog frameworks.
There is a good tutorial here on taking your design you make in webflow and integrating into Wordpress using the Ultimatum framework here:
You could always embed something like Nabble. I don’t recommend that for SEO reasons, but, it can be done.
The guys here at webflow have “I feel” big plans for WF and look at moving to the all in one package in the future. “Would be a big relief and asset” to have something like that.