No, I agree. However, for me, it goes into the issue of choice and the fact that Donna's choice about what happened was taken away from her.
Which is why I wrote fic. :) Although there was a lovely meta (the LJ has now been deleted, grumbles) which argued that Donna had become TheDoctorDonna (her mind taken over much like Sky (I think?) in Midnight, and she had to 'die' in order for Donna herself to survive. I like that take.

I think that's a requirement for a companion, isn't it? To ask the Armour-Piercing Question as TV Tropes calls it, to make him stop and think.
Good point. :)