You misunderstand, at some point there was a shift in mainstream Hollywood blockbusters from movies like Die Hard, which was just good cop shoots bad guys and adaptations of Tom Clancy books to movies like Gladiator with original epic soundtracks and an attempt at 'deep' dialogue and more 'serious' themes.
Sure, you had movies like Rocky and such which also focus on the Heroes Journey but not with the same, shall we call it pretentiousness as Gladiator.
Which sort of presented itself as a work of high art. There are elements in the film that certainly inspired other films.