What additional arguments besides personal experience would you give to back this precision claim?
Temperature scales are arbitrary by nature, and the criteria behind their definition can be useful or not. Fahrenheit’s isn’t that much useful compared to Celsius’ or Kelvin’s.
Privacy versus convenience… For what I know, the most common solution to your concern would be to setup a Calibre server and access it via your Android devices. But that’s obviously a tad more complex than uploading EPUBs to Google Books.