I consider the Harpsichord an ‘unevolved’ Piano (see also an Wikientry about it’s History). Until the year 1700 the Harpsichord it ruled supreme - until the Italian Bartolomeo Cristofori finally invented the Piano.

Just in time for such Giants like Mozart and Beethoven.

To my ears the Harpsichord sounds very flat und without passion. I can’t hear more then three pieces of Harpsichord music until I need a change. Very different to good Piano music …

Listen for yourself - Harpsichord: 

In contrast a Piano piece: