maximalism

noun2

1. •
   The opposite of minimalism: a tendency toward excess.

   • With its romantic harmonies out of Berlioz, the 4½-hour “Einstein” score marked a passage out of Minimalism into a new genre that John Rockwell dubbed “Maximalism.” — 1981
2. •
   An ideology favoring radical or aggressive action to achieve expansive goals; the stance of maximalists.

   • Debates between advocates of territorial maximalism and supporters of territorial compromise place heavy emphasis on considerations of military security. — 2019