Mortar work is still the standard in San Francisco and I hope that doesn't change.It gives you the ability to do whatever you want wherever you want on perfectly plumb and level surfaces.In my experience cement board isn't any quicker to install and just causes problems with it not being perfectly plumb and level.I realize that San Francisco is a very wealthy city and that people do spend vast amounts of money on their homes allowing you to not have to cut corners.Still it is a shame that a superior method of installation seems to be disappearing.We didn't use to consider people who didn't do their own mud work as tilers.Oh well,times change.Keep it rolling Rob.