Alex Strife
Ex-SOLDIER
I had seen that trailer before. And either way, it's typical for things to be graphically less capable when the real game comes out. Okay, maybe not typical but it's not that strange.
You make something, it looks great, you run it on a computer. You put it on the console and... uh-oh! Surprise! It's slow. Or you add too many details outside of the character and it's too much for the console's memory to handle, etc.
Bear in mind FFX's development was overlapped with FFIX and FFXI, at some point. So it means it came early in PS2 development, so it's not surprising they would misjudge its capacities.
You make something, it looks great, you run it on a computer. You put it on the console and... uh-oh! Surprise! It's slow. Or you add too many details outside of the character and it's too much for the console's memory to handle, etc.
Bear in mind FFX's development was overlapped with FFIX and FFXI, at some point. So it means it came early in PS2 development, so it's not surprising they would misjudge its capacities.