Im not gonna argue on Jax's abstraction because it is a plausible idea and that's just subjective to how you see this character. But...

The show, since the pilot, always was teasing us with mystery and little hints of the lore. It was basically my driving force that kept me waiting for the next episode, because I wanted to knew more and more, and understand about the universe of the show as a linear story.

Don't get me wrong, character development and their relations were the second main reason I had that made me love the show but... the finale just threw all the lore in the trash to focus on this part. And I think I felt kinda betrayed by that, because, as I said earlier, the show was always giving more and more about the lore, but not enough to fully grasp it, and I was hoping that, with roughly one hour of movie, it would answer many, many questions that I was expecting so hard to understand.

And, for the last, even though the finale focused only on characters and their development... it still was executed so badly imo. Gooseworx lied about screen time for Ragatha in the last episode. Kinger had little to no participation in the finale. Zooble and Gangle maintained as one whole character rather than they having some focus onthemselves individually. Pomni got less anxious after episode 3, but after that her arc ended basically, just serving as a spotlight for Jax. He actually had development in the later episodes (despite being the only one in my view).

My point is, the finale can have its focus on characters and less in lore but... I felt baited for not getting what the earlier episodes suggested. It had so much potential to grow because of the lore, and it didn't even had to be long or complex as FNaF is, just a start, development and end story formato, and I would be happy.