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I would simply say that the WHOLE concept of "DEMO" is very twisted in modding communities.

What are people doing DEMOs for? Attention, mostly.
Yet, it is a bad marketing move to release a DEMO a year or two before the actual product.
The Hype will die out and you just fulfill your need for validation.

DEMO as in demonstration has its purpose if you have something to show. Like an engine.
It makes sense for someone to DEMO their custom engine and show its capabilities, or you could perhaps create a DEMO if you're using all your custom assets, then you're DEMOing the art style.

But DEMOing a story is in my opinion called a spoiler more than anything else.

But you skipped over the fact what if some demos show different/altered gameplay. Nercologue's Demo was released almost a year before the actual product was released but now the mod's one of the most popular amnesia mods out there.