It's not about "the centipede is too scary", it's about "seeing the centipede causes an involuntary physical reaction beyond fear and could have an adverse effect on my physical and mental health." Phobias are not something you can just "get over" or "power through", they're mental illnesses that can be debilitating. The game does not have a focus on centipedes or similar creatures, and the game doesn't tell you it exists, so someone playing would have no idea it's there until they encountered it, triggering a harmful response. This is not about making the game less scary for babies, there's already Ambient mode for that. It's about accessibility.
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I don't personally have any phobias, and I still think phobia modes would be a very good accessibility feature. I have a friend whose phobic of centipedes, and he really can't help it, but he loves everything else about the game including the horror / atmospheric aspects. I don't think letting people like that turn off or change how the creepy giant big looks will ruin the game's atmosphere, if you ask me, especially if it's incredibly optional.
I mean, scientifically speaking, you can actually just "get over" phobias and it's a thing people regularly do. Even so, the question is "should someone have to conquer a primal fear response in order to play the game?" and "no" would be a pretty reasonable opinion.
Being that the game is in development, the caves aren't even remotely important to progress, and basically the only way to know about them is to look it up on the wiki, it's probably best to put it on the "nice to have" list and get around to it later on.
If it's a mental illness then I regret to inform you that perhaps this content is not for you and you should find something else.
Call it whatever you want, the idea of liking "horror" but only if horror doesn't contain things I find "uncomfortable" is ridiculous.
Stop the "I have a phobia trend" and get over it. Are you also going to ask spiders in your bathroom to mutate to a box with the word "spider" on it?