User blog comment:Cristina7/Introducing Discussions, a New Platform For Engaging Your Community/@comment-25648422-20160909022021/@comment-452-20160909030424

"The Forum may suck when viewed on mobile but it is because the Forum hasn't been set up in a way to look good in mobile."

Exactly this.

Justifying the creation of Discussions with the fact that the new Forum is unfinished and they haven't updated it for mobile is exactly like saying "I haven't finished my homework because I deliberately fed to it my dog".

There is no reason why a mobile interface could not be created for the existing forum other than laziness.

If Wikia just finished the new forum and created a mobile interface, they wouldn't need to create the Discussions feature.