"Furthermore, Nuance Communications is a far cry from the NSA or advertisers."
If the data is there, it is accessible by the NSA. That is why people have a concern about this. Listening to Samsung say "oh we have decided to only share it with X person, so you're good" isn't making anyone feel better. Having the information in the first place is what is alarming to people, not what Samsung is CURRENTLY doing with it.
Data needs to be protected. Policies that explain what is being done with the data are not sufficient to protect it's use. I think with the NSA information recently as well as the constant large profile hacks (think Sony, Anthem, Target, etc), people could care less what your privacy policy says you do with the data. They care that you have it in the first place.