However, I would argue that it also loses some impact. It removes the idea of a person having to decide what "best" or "worst" actually means. Instead, you would need a follow-up question of "why?" to clarify that particular point.

For instance, I would have answered French horn. That instrument can single-handedly cut through an entire orchestra, and there is no mistaking it when you hear it. The harpsichord would be a close runner-up. So I'm probably looking for unique sounds that are easy to pick out of a crowd.

The best instrument is the one I like to play the most, duh. Yeah, "that's just my opinion, man". Which was kinda the point.

I don't know what else to tell you. You ask "what the obsession with ranking" was, I gave you the answer straight from the article. Is it "best" for you? Probably not. Again, duh, that's not what the answer said.