Quote Originally Posted by VerdeLuck View Post
It's a capstone you get afterwards. Saying it's optional is just being pedantic. The developers said it would not factor into the main game and you wouldn't need level 90 crafters for the content inside.
They said it wouldn't be "required". And it's not. You can do all IS content without it.
Again, I would like you to define optional.
You yourself refered to this content as optional, but apparently when I use it I'm being pedantic.