Why was the trial finisher disabled?

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This is ignorant. Photosensitive seizures are not just blanketly triggered by SFX and other things like that. There's a specific speed and sometimes light patterns that can trigger these seizures. It happened in Japan during the first season of Pokémon in an episode with Porygons - and animes can be insanely crazy and active at times, but that specific crazy light stutter caused tons of kids who'd enjoyed the anime without issues to suddenly have seizures, to the point where that episode never aired outside of Japan.

Try to be a little more understanding of documented health concerns like this, instead of trying to claim it's a myth because you don't have a seizure when you watch Spiderman.

The trial finishers have about as much animation as the emotes, which is to say, there is basically none.

If that, ie a couple frames of mostly static 'animation', is apparently too much of a stimuli for a person, then I'm not sure how they're even supposed to look at just about anything.

.........

Also, I'm not saying photosensitive seizures is a myth. I'm saying the reasons to shut down the trials finishers make no sense because the said finishers almost have no animation, and it also makes little sense when the actual game is far more stimulating but is apparently fine and somehow the barely animated finisher is a trouble.

.........

EDIT: And since the finishers almost have no animation in the first place, if the frequency of the tiny handful of animation frames is the big deal, they could very easily simply offset them a little. This can be done literally within 10 seconds. There is little point in simply removing the thing altogether when it's so easily fixed.

{quoted}

This is ignorant. Photosensitive seizures are not just blanketly triggered by SFX and other things like that. There's a specific speed and sometimes light patterns that can trigger these seizures. It happened in Japan during the first season of Pokémon in an episode with Porygons - and animes can be insanely crazy and active at times, but that specific crazy light stutter caused tons of kids who'd enjoyed the anime without issues to suddenly have seizures, to the point where that episode never aired outside of Japan.

Try to be a little more understanding of documented health concerns like this, instead of trying to claim it's a myth because you don't have a seizure when you watch Spiderman.

Random Fun Fact about the Pokemon incident: Ever since that episode, Porygon has never been featured in the anime again, and its two evolutions have never appeared in an episode.

Such a shame cuz they're some of my favorites

The top 3 causes are usually "strobing" effects (rapid flashes) / suddenly switching from a very dark or cool color (ex. black or blue) to a very bright or warm color (ex. white or red) with zero gradient / or rapid motion across a large area.

While there's always going to be a risk, I'd say the first two are the most common triggers, and the 3rd one is a bit more situational...I don't have it, but I studied health topics in college, so I'm slightly familiar with it.

Also a good time to state the somewhat obvious - that the more risk factors there are, the more likely the chance of it happening. The Porygon episode for example essentially had all of these factors at once - multiple scenes where the entire screen strobed in a red/blue alternate with other screenwide motions (pokemon things) happening in the foreground.

The same was true about Incredibles 2 - scenes involving the villain strobed black/white across the entire screen while fighting happened in the foreground.

The finishers had a lot of strobing effects and some of them were worse than others. While you'd think "that's small, and nothing like your examples" it honestly almost makes it worse. Strobing effects naturally draw your focus. The fact it was small instinctually has you further focus to see what it is. The combination of those things makes it a natural beacon, and the sensory assault from focusing on a small, strobing point is enough to trigger the overload we know as an epileptic seizure.