Probably by "most" he just means he's talked to 20 friends who head up devops for such large-scale platforms, and 19 out of 20 explained how it didn't work for

Probably by "most" he just means he's talked to 20 friends who head up devops for such large-scale platforms, and 19 out of 20 explained how it didn't work for them, and he then assumed that's generally applicable for the other couple thousand out there.