Probably the trend of open world fatigue that has been kicking around the last few years. Games pushed for larger and larger worlds until the public realised that it's only great as long as the worlds are interesting, feel "alive" and are easy and fun to get around in.

Map size seems to be shrinking back down, or at least not be the main selling point for open world games nowadays, and there has been significant criticism of the objective style missions that seem to have become the "fetch quest" of the genre.