“Collection of data is disclosed to and controllable by users”? Well, if the users presume that collection is going on unless said otherwise, then maybe.
Annoying thing is, I'd quite want to use the voice assistant. Do I like to fiddle with integrations and workflows? Oh boy. Damn well I do. Do I know that my voiceprint won't turn up on Google's servers the minute I use the assistant? Nope.
(Btw, another baffling trait of the Android ecosystem is how many well-known and widely-used hackish tools are closed-source: those from XDA and such. “Flash this binary to root your phone”, “install this blob for low-level customizations”. Eeeeh? I think I'll just disable all Google's misfeatures instead, for now.)