I'll still go to bat for the original 2013 game, not the sequel, not the remake and not the TV show.
But I do think the original game is good if you can divorce it from the shitshow the franchise became (I'll always have fond memories of it, but not sure I could go back to it given everything since)
I think Amy Henning and everyone else at Naughty Dog at the time is who deserves the credit for why it worked, it turned out good despite Druckmann.
In interviews at the time they heavily implied it was meant to be a standalone story and that's how it works best.
There was a window of time there in the western development world where the push for "games as art" lead to some interesting things, but it all got so badly turbo fucked in the ass by politics that now you long for when stories were just "the President has been kidnapped by ninjas, are you a bad enough dude to rescue the President?"
The thing about the Silent Hill movie is taken on it's own it's good, good cinematography, set design, art direction, special effects etc.
It's a well directed movie, the trouble lies with the script, the writer misunderstood plot points and made pointless changes, the director clearly had passion for the source material (even if he kind of misunderstood it too), with the writer it feels like an obvious work for hire job.
It's a weird situation, I both don't hate and hate the movie at the same time, I hate the impact it had on the fandom and the series itself, but if you can divorce it from all that it's a solid movie on it's own (and nostalgic, really takes me back to 2006)
The new explanation is that the infection spread through wheat. It's why they keep mentioning breads and everyone is eating biscuits.
The original game makes reference to infected crops spreading it.
My theory, no clue if it's even been gone into since, is that the fungus came from the south American rainforest and gained exposure to crops through deforestation.
Maybe it started off as one thing and quickly mutated once exposed to north American elements, like the Venezuelan spider in the movie Arachnophobia mating with a north American spider and giving birth to a new hybrid breed.
Given the developers Uncharted games, the first of which also involved a mutating virus originating somewhere in south America, feels like they would have had it on the brains and makes the most sense.
But as is usual with this genre, it doesn't really matter where it came from or needs to be explained.