What did you think about that?

I thought that it was natural, as they weren't main characters to begin with, but then AC makes it seem as though they were. I mean DoC did "explain" it with an explaination that they were in Shin-ra at the time, but that would make it seem as though the creators were confused as how to include Vincent and Yuffie in the compilation.

Any thoughts?

If I remember right, the reason why Yuffie and Vincent didn't appear in the ending FMV was just simply because Squaresoft had run overtime on the game's development, exceeding Sony's planned release deadline, and hence the development team just didn't have enough time to create a separate ending FMV sequence with them included, seeing as they're optional characters after all. It's not too big a deal not having them in the ending anyway.

They would have had to have made four individual FMVs: one if the player didn't get either Yuffie or Vincent, one if the player only got Yuffie, one if they player only got Vincent, and one if the player got both. I suppose they were either pressed for time or didn't want to put the effort into making these endings. I didn't care that they weren't in it, I got the idea.

it didnt bother me all that much.

This one is easy, if you look at the size of the PSX Final Fantasy VII CD files you'll notice that the main ending video is quite large, it takes up a big chunk of CD space, if they were to include them then they would have to make 4 different ending videos:

- Video without Yuffie and Vincent;
- Video with Yuffie only;
- Video with Vincent only;
- Video with both Yuffie and Vincent;

But I actually think that they could have solved it easily by adding 2 small videos (one for Yuffie and one for Vincent) and only playing them if you got the corresponding character, it's been done in other games.

The time constraint was the biggest problem, they had to rush it, or they would have figured something out (like removing access to some places on CD3 to make space for these small videos).