Getting the most out of the Wordpress plugin

I would second what Maiki said, and add that the way I often explain this to folks is that you can think of Discourse comments in Wordpress as a way to entice people into your community. You likely want people to come across and spend time in your community itself. There are many wonderful and rich features of Discourse that will only ever be on the Discourse platform, even if two-way commenting (e.g. being able to compose a post in Wordpress) is ever possible.

That said, two-way commenting functionality has been discussed in more depth here:

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