Someone may want to know if you are a Democrat or Republican (for advertising, for gerrymandering, whatever). That person may not be able to ask you a direct question like that though (or may feel that you may lie about the answer to such a question anyway).
As such, they likely carry out occasional surveys asking people who are Democrat or Republicans for their opinions on something else. Once they find something else that can strongly correlate your political affiliation with a specific opinion, they know of a new question they can ask someone. That new question should generally reveal what your political party is most likely and they can then proceed with that "most likely" answer.
So "who cares" is those who cannot directly ask you something. They will ask you something else and use that answer to deduce the information they cannot obtain directly.
MiXplorer - https://mixplorer.com/
A file explorer allowing for me to transfer files over the network. When Solid Explorer suddenly didn't seem to want to do network transfers anymore (likely because Windows updated something), I waited for that app to update to fix the issue. It never did. I found that MiXplorer was a good alternative that transfers files over the network just fine and works nice and fast as well. The interface takes a bit to get used to (meaning it isn't the same as Solid Explorer) but the app is certainly worth using. Importantly, I can transfer files over the network without issue again.
Notably, this app is free to download (from XDA) however the Google Play version is not free. The Google Play version (which supports development) is a one time paid fee.