In general the advantage of having two softwares sharing the userbase is terribly useful when you have community generated content. You don't force them to create a new account and if is well integrated you can share the bio, profile pic and everything, making it smooth. Specifically with the CMSs, some use them as kind of "social network" (for example with buddypress), or a forum can be a place to have internal members discussions, which as soon as it gets over 10 members can be difficult.
In general you want to make it as easy as possible for contributors to contribute, a forum can be a a perfect place to solve problems, post internal guides (which WP doesn't have as a feature) and so on.
Can't wait for flarum to be stable and see all those integrations popping up!
> @vulcano Can't wait for flarum to be stable and see all those integrations popping up!
Most of them will be paid plugins. WordPress integration already is. I would blame WordPress for not providing a good forum solution. Joomla has a couple of good options but paid. Not sure about Drupal.
> @vulcano You don't force them to create a new account and if is well integrated
> @Abhi Most of them will be paid plugins. WordPress integration already is
What if someone comes with a free plugin ?
Why just WordPress, you can try a Joomla plugin. But then you can use Kunena and other forum modules. I am sure there will be some integration with Joomla 4.
I checked Drupal extensions and distributions last day. Most of them looked dated. I have nothing against Drupal but once you see such dead activity around the very new Drupal 9, people tend to move away.