I mean, you are heavily underplaying the fact it was a pilot. That is exactly why it behaves the way it does and makes certain choices. It was about selling the idea of the show to Disney. Actual proper plotting and pacing would have come once staff could have been brought on board for it.
This would have never been how the actual show would have played out. And as noted by Seth himself, he was assisting other people with their own pilots unrelated to this, so he didn’t have a ton of time to work on it.
This was one dude working on a 11 min pitch for free. You’d be shocked to see some proof of concept pilots that existed back then for some of the best shows.
It’s like having no knowledge of KH at all, pointing at the weird lion boy Sora with a chainsaw and some of those weird concept worlds like vague barn world and going “probably wouldn’t make a good game.” Well, yeah. It’s proof of concept. We don’t know how it would have ACTUALLY been.
But it is all we can go off of. I don’t think we need to speak about the merits of if this particular rendition would have worked or not because we’ll never know. We can’t even speak to if this would have prematurely hurt the series or helped it. There isn’t enough info for that.
And the gags and action feel in line with how the characters would act in the game. Plus Riku interacting with Donald and Goofy was nice to see, as was Goofy being something like a father figure in the SDG trio. Also, Jiminy narrating like it’s an entry in his journal is a very nice touch 
