Originally Posted by LóFarkas
People tell others to raise their saddles because from a pedaling ergonomy/knee health point of view, the vast majority of people ride with too low saddles. Silly considerations like being able to get up on the saddle without a stepladder and being able to put a foot down etc. Too low saddles cause hellish knee pain. Pretty simple.
Also, there is some evidence that raising the saddle even higher than is ideal for power transfer will further improve the knee situation.
I noticed that too high a saddle will cause me great knee discomfort. This is related to the fact that my legs are not straight, and my joints don't evenly distribute the weight. Anyhow, your advice is not necessarily universally true.