Cost savings and waste reduction. Once food leaves the kitchen it has to be thrown out. A couple of uneaten pieces of bread here and there may not seem like. But multiply that by 300 tables and then a fleet you have a lot of wasted food.
Not to say that cost isn't still the prime motivator.
BPC - I think sourdough would be great, it is best warm.
All I ask is a tall ship and a star to steer her by; John Masefield
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012, Dream 2013
Celebrity: Summit 2011
Princess: Ruby 2010, 2014, Caribbean 2013, Coral 2014, Regal 2014
Star Clippers: Royal Clipper 2015