As a general principle, we must acknowledge the ear has difficulty grasping a large number of different chords in rapid succession. This principle becomes more true as the number of real parts increases.
Thus, two part harmony allows for frequent change and short duration of chords. But in four part harmony and more, chords require a sufficiently long duration to give its essential notes enough time to resonate together enough to freely establish their acoustic vibrations.
As the harmonic texture becomes more complicated and dense, its more prone to confusion and as a result, doesn’t allow frequent and quick chord changes.
Old Music Theory 