Yeah, the button presses in ff8 psx would be at a full 60fps. You are losing 4x the accuracy to press it. As Covarr said, just the same problem as the inaccuracy of the reels in FF7. Related to this is the PAL version of fighting games. In the UK, we had to suffer the fact that, for example, Tekken Tag would run at 50fps. This meant slower characters, but also more inaccurate button presses. At a full 60fps, fast reaction times are significantly more beneficial to winning than at 50. Imagine it this way: If I press a punch at frame 34 and my opponent presses block on frame 35, in the 60fps version, this will be registered as a hit for me. But in PAL, the loss of 10 frames may mean they are registered on the same frame (since the extra accuracy does not exist). So a block will be registered. Remember, life "runs" at a much higher "frame rate". There has to be a limit to how many snap shots life itself has. How many fps we could theoretically make a game before some sort of limit (like the speed of light is a universal constant to velocity). I haven't looked into this much, but I do recall that one prominent theory is that life is actually like that - snap shots. So what I am trying to get across is that relative to life, 60fps is 60 snapshots of life. And when you change that to 15, you can see why this is detrimental across the board. Your brain and eyes have a processing limit too, of course, which is why you see 30fps as a smooth motion
It's all a trick of the brain. Some people have had damage to the specific part of the brain that joins frames into a continuing motion—for these people, a waterfall can appear completely still - then "update" at irregular intervals (the condition is called akinetopsia).
Solution? Make FF8 battles 60fps
