Curtis - thanks for your list. I thing each fact might need to be followed by "a good TA ..."
However, if I'm traveling to a cruise on Saturday and my TA doesn't work weekends they are unable to help me if problems arise in my travel. As others have noted in some cases the TA stands between the traveler and provider. Sometimes this is a help and sometimes it is an hinderance.
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