I would also agree with you on this one and add that the original video she did was the accoustic one of the song and displayed what I feel was more emotion and nearly brought a tear to my eye as this new slicker version didn't evoke the same feelings. There were more ordinary people in the first one and less of Naomi giving the piece more of the "message from the community" as you mentioned.
To be honest, I was expecting a lot more of that sort of imagery than the original video as she had put out a call for more personal video clips (I was going to submit one, but never got around to it), but instead she had less of them and even used some of the same ones from the original or new clips from the same people. In her opening statement she mentioned getting more clips than expected and in my opinion did what seems to be a lazy cop-out and only having a few in the final piece.
It is somewhat disappointing as well with her choice of the added instrumentation. The song now has a more "flowery" tone to it and as it may sound more profesional it lost the emotion that I mentioned earlier and to be frank - I still like your (Federico) version the best. It has just enough of an added sound to not overwhelm the guitar, but add to it or as you state - Make it more "complete".

Having the others playing along with her - I didn't think of that. That would have been different, but probably difficult to pull off successfully. I thought that maybe she could have had herself in the beginning and at the end with the rest showing only those that submitted video's with maybe a long instrumental section in the middle to be able to add more video segments or just a longer version of the song. Basically, there could have been numerous other ways to get the effect we were thinking she could have done.