This does make me think about changes to the essays at so many schools...to me, it seems like a lot of the essays have been made easier or at least less intimidating. Maybe some schools think this will encourage people to take a chance!
I have a different theory. I actually think that the major influence of the changes to the essays are the admission committees' reaction to the booming admission consulting industry, which now include a number of ex admission committee members. I sense that admission committees feel they are being 'gamed' by the applicants who increasingly utilise admission consulting services to help them with their essays.
Therefore, they'd like to rely less on the essays, and more on interviews during which they can ask more probing questions. HBS new requirement of writing a reflection essay within a day after the interview is a prime example of how admission committees are trying to make it difficult to get coaching on all components of the application. I believe they'll pay particular attention to whether there is any difference in terms of writing style between this reflection essay and the other essays that an applicant has more time to get coaching on.