It depends on what you mean by “point”?
They made a movie to entertain people, never forget that. It’s not all world building, or even franchise building. One of the worst things filmmakers can do is assume there’s going to be a ‘part 2’.
“Oh we’ll get to the good stuff later, we’re setting it all up now.”
This movie ends in a satisfying way, ‘IT’ is defeated, but not destroyed. Just like a lot of stories end.
There’s more story to tell and, because this one has been so successful already, we’re going to get that story. But no-one took that for granted and it paid off for them, and for us.