[nrmehta]

Definitely agree with the comments here. One thing to add is I think some of this comes down to ex-ante versus ex-post thinking. Ex-ante, many things are required to make any substantial change. Ex-post, we can scrutinize and analyze and sometimes create a version of history that points to one as the key factor. As others have pointed out, sometimes this is simply a top of the stack situation (last piece of effort is most important but would be true for whatever is last) and sometimes it's a genuine catalytic change (the last thing really was the biggest). But since our decision-making about the future is fundamentally ex-ante, there usually is no silver bullet. Also ex-post analyses are often based upon human surveys / analysis, which is highly flawed. If you ask people, for example, why they love a certain product, they may respond with one feature and you might think that was the "that one thing" when in reality, they might love the overall experience, branding, support or something else entirely.