It can just be a placeholder ‘blob’ even. The feature is solely so the arachnophobia is removed. That doesn’t take much effort. The effects can stay the same and the quality is of no meaning for a placeholder mechanic to alleviate a frigging anxiety attack.
Not everything needs to be top-notch, sometimes just ‘having it’ to start out with is enough, leaving everything beyond for the future.
The amount of arachnophobia and how it showcase is different.
For example with phobias… my mother has one about common earthworms, can’t get close to them, actually has a panic attack when one gets too close and has to physically move away from where it is until her mind reasons it can’t be there anymore. Which is usually a day or so.
In comparison I actually have arachnophobia, under control though. Depending on the type of spider I can not approach it. I’m not disgusted - like my mother is - but instead feel a physical need to get away from it, direly.
When a spider is sitting about in my home it takes me up to weeks to remove it since I need to build myself mentally up to handle the situation, avoiding it unconsciously for any miniscule reason of other stuff being more important. I don’t get anxiety attacks or scream, but I’ll flick a spider should it crawl onto me away like an angry wasp trying to sting me, getting hard physical symptoms of elevated blood pressure and heart rate.
Seeing a spider in a game though or just watching it is no issue. And depending on the type of spider I can actually even touch it. A tarantula? No issue having it crawl around on me. A daddy long legs or a small spider? I break down.
The variety of phobias is as endless as they come, and yes… you’ll likely never know some people have some specific severe phobias around you unless they outright talk about it, which is a social taboo still nowadays though as people get made fun of if mentioning it often, hence it’s kept in the background and ‘ignored’.
So what you see with the 3%-15% is the 3% known amount and the expected margin with the dark number raising it up to around 15%, a large variety of those people having no severe issues and there being a huge variety of severe reactions of different sorts at the other hand… with very few people.
Hence as mentioned… low priority, good to have over time.