if you have replaced hardibacker or durorock walls I am very surprised. They did not cover the next steps for prepping the cement boards for tile which includes the proper type of thinset and fibertape, as well as other, extra insurance against failure of the tile substrate install. That is not to say that Schluter is not a great product as well, but I have had great success with cement products over many many years. Its all in the prep. Also a proper mortar mix has a lot to do with the performance of the tile substrate as well.
give them a break, they are enthusiastic 'students'
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