[kaishiro]

As someone who has consulted on more enterprise level websites than I can count, this has not been my experience at all.

[caseyohara]

Can you point me to an enterprise level website that uses semantic classes?

[kaishiro]

I cannot, for professional reasons, point you to any that I have personally worked on. However, Smashing Magazine (https://www.smashingmagazine.com) comes to mind as one of the early adopters of both highly semantic BEM and an SSG methodology.