Thoughts from I love typography…
Though I have the utmost respect for Massimo Vignelli, and am a fan of his work, his we use too many typefaces is just plain wrong. It’s by no means the first time Vignelli has voiced these views…
For any designer to claim that a half-dozen or a dozen typefaces is enough  well that’s their prerogative. However, it’s one thing to say ‘twelve typefaces is enough for me, but to claim twelve typefaces is enough, period; extrapolating a generalisation from a personal imposition is rarely, if ever helpful.