I honestly don't think that teaching ability is that important for MasterClass, because I think the videos are primarily consumed for entertainment and creative inspiration, and less for earnestly learning a skill. Charisma and/or starpower, along with excellent production values, is probably exactly what they want and what they need. It's not Khan Academy.
That's certainly how I consume lots of similar educational content. I watch lots of videos of people who are passionate and experienced in some discipline simply talking about, demonstrating, or teaching that discipline, even when I have little or no interest in actually learning the discipline myself. For me it's cooking, 3d modeling, filmmaking and photography, musicianship, home construction, electronics, bushcraft and wilderness survival, and many more that I can't recall at the moment.
I would agree with that, and think it is valuable in itself. But the pedant in me gets frustrated at that, combined with the whole "I'm X, and I'm going to teach you Y".
That's certainly how I consume lots of similar educational content. I watch lots of videos of people who are passionate and experienced in some discipline simply talking about, demonstrating, or teaching that discipline, even when I have little or no interest in actually learning the discipline myself. For me it's cooking, 3d modeling, filmmaking and photography, musicianship, home construction, electronics, bushcraft and wilderness survival, and many more that I can't recall at the moment.