Well, Jack, they are all playing the notes that Bach wrote, and they are also playing the music of a composer who, notoriously, gave far less direction than most other great composers as to instrumentation, tempo and expected style of playing. Do you prefer the Goldbergs on harpsichord or piano? What did Bach say? We don't know, do we? Let's see you carry out a similar exercise with the start of Beethoven's violin concerto...

Exceptions that prove the rule don't make for persuasive arguments...