I hear you, and I appreciate the need to consider individual factors when it comes to cycling efficiency. You're right, cadence is just one piece of the puzzle, and it's not a one-size-fits-all solution. It's easy to oversimplify things, especially when we're trying to give advice.
However, I'd argue that monitoring cadence is still a valuable tool, even if it's not the only factor. It can help cyclists identify patterns and make adjustments to improve their pedaling efficiency. But, as you rightly pointed out, it should be considered in conjunction with other elements like muscle fiber type, aerobic capacity, and biomechanics.
In other words, cadence is like the tip of the iceberg - it's visible and can give us some clues, but there's a lot more going on beneath the surface. So, while it's important not to oversimplify things, it's also important not to dismiss cadence as a useful metric altogether. Instead, let's strive for a more holistic approach to cycling efficiency, one that takes into account all the various factors at play.