I had gone through the Foundation series as written and at this point the series was getting to be more of the same
The most interesting part of the book was how Assimov created different societies on the same planet. Most sci-fi books have the occupants of an alien world as one grand unified society, whereas Assimov makes Trantor more like Earth. Several different "sectors", basically countries, with different beliefs, values, ethnic traits, etc.
Yes but only as part of the series
This is part of a series that can be a short (Foundation) series, or a much longer one if you start at I Robot.
Nothing, it's just easier to find time to listen than to read