prosurfer with my extension, Wordpress becomes a new social login option. You can then decide if you want it to be the only option, or to keep other login options (regular Flarum password login). You can even use FoF OAuth and other Flarum social logins together with Wordpress login. But I know most customers use Wordpress as their main account or they have an existing userbase from when they used Wordpress comments so they usually add social login directly to Wordpress, and then make Wordpress the only login method for Flarum.
The extension will not automatically create Wordpress users. If you make Wordpress the only login method and the users don't have a Wordpress account, they will have to create one manually first. They will then automatically be connected to the existing Flarum account that shares the same email.
If you only want to enable Wordpress login for convenience for your writers, I would suggest keeping the regular Flarum login for your other users. You could use custom CSS and/or Linguist extension to hide, move or rename the Wordpress login button to say "Writer login" or something like that. The Wordpress login is not required to comment on the Flarum comment threads for the Wordpress posts.
I hope this clears things up! Don't hesitant to ask if you need more details.