I believe a lot of people wanted a more complete story experience in Final Fantasy XV. The major criticism is that the game feels incomplete. So when developers hide major story elements behind a paywall, should we pay for them?
While Tabata and team are making patches to further jolt the lackluster story, will this include:

Why Gladio left? Where Gladio got those scars?

What happened to Prompto after falling from the train?

How Ignis became blind?
The side characters Cor, Ravus, Emperor Aldercapt, Cindy, Iris, etc.
And what if they do decide to make these story-elements paid DLC?
Will this be justified?
I believe paid DLC for story elements run counter to Final Fantasy’s philosophy. Each installment was to be a self-contained experience. We needed no spin-offs, no movies, etc. to explain the story further. And this worked for a decade. When Sakaguchi got the boot from Square Enix, his wisdom went down the drain. Now the company regressed to back-peddling, adding on extra characters to make sense of the story, often muddling it.
I know that for suggesting we take Sakaguchi’s approach to Final Fantasy I have Tabata’s dreaded “Final Fantasy disease”. But “Final Fantasy disease” is a damage-control statement to explain their current business model. It seems weird to make gamers pay for story crucial to the horribly paced plot. I believe the least they can do to make up for it is to make storied elements free for DLC.