I suppose it's just like the ' I've tiled on ply for years never had a problem' (which most tilers have)
But more and more problems come out, so they bring out better products like backer boards and anylfix .
Still nothing wrong with that way @DavidHoweTiling nothing at all.
however, judging by the sales on Anhyfix, i believe many are moving to a gypsum based adhesive, i guess its all about education, without the forums we would all probably still be none the wiser.
