Did you happen to notice that there is expected to be a complete lack of any blame laid on any person? Internationally people tend to think that if mistakes have been made, they were usually made by someone, they don't just appear out of thin air. People need to be held responsible. "Sanctions" along the line of "[military institution X] could you please do things a little differently next time, k thx" are not exactly what is expected from a proper investigation. You may also note that the expected results of this "investigation" disregard the question of whether the IDF was allowed to do the boarding in the first place, it just asks if the boarding was conducted in the best possible way.
Man shot dead in northern Israel town of Bi'ina, police say the murder was gang related (Haaretz)
from the article: IDF to blame navy in scathing report on Gaza flotilla raid