Why are individual piano / synthesizer keys so long, when only a small portion of the key is used when playing?

Question

Why are individual piano / synthesizer keys so long, when only a small portion of the key is used when playing?

In: 32

Answer 1

First, so that you’re thumb can reach the keys that you’re other fingers can. Second, to give more leverage so that the hammer can hit the strings more easily. Third, to give more control to the fingers so it’s easier to control volume.