Rant on.
So to get the full benefit of the new typesetting engine I have to go to the Amazon site and look up each of the 2,138 Kindle books I have to see if it's been "enhanced".
Then I have to redownload each one of them and check to see if it really has been.
Then I have to add the new files to Calibre and add a new custom column to specify whether or not each book has been enhanced.
Then I have to delete and re-send any books currently on my Kindle.
Then, periodically, I have to repeat the process for all hitherto un-enhanced books.
No typesetting on earth is good enough for me to go through all that.
Rant off.