The thing is, depending upon the house structure, it doesn’t NEED to be mentioned
if Jack’s creating his own world, we could just see chaos and dead bodies, that’s all
Not acknowledging it is not dropping it, it’s just deciding it isn’t necessary to THIS story
And, honestly, it could never be acknowledged again and (as long as the stories are good) that would be fine
Remember, Krueger killed kids, but eventually moved onto teenagers because the kids grew up
If we use that logic, Jack is over 100 years old, so I guess he should be going after centenarians at this point
He’s also killed grownups at every stage show he has had
(Read as 18+ year olds are fine victims for him overall)