Comment by brudgers

By "tuning was what it was" I did not mean that JS Bach's organs were out of tune with themselves. But rather the obvious thing that pipe organs can't be retuned to arbitrary temperaments in a practical manner.

And to be clear, Well Tempered Clavier is generally believed to have been written for harpsichord not organ. There is not more evidence that it was a plea than that it was simply JS Bach writing experimental music for the latest technology.