A Company I sub to have recently run into mega problems, still owed around 350.000 by a multi national retail firm , all because the tiling mob they used to do the work succumbed to the call of new technology, ie, 'modern addy ' , had they applied the 'not broke dont fix' mind set,maybe a lot of grief would have been averted. The method that should have been implemented I observed in ancient buildings in Rome ?, amazing. I did a sandstone job, fixed 400 X 400 bedded in s&c to a line, one by one, a load of greek fixers used the same stone, fixed it with adhesive, same conditions, same builder, same everything on a property about 1/2 a mile away , they scoffed at the old timer labouring away down the road, two months later they were back replacing about 70% of their project, very efficient,so much better these modern adhesives ?, yes modern 'addy' does have its benifits, but it also has limitations and is not the be and end all of the tiling trade. I have witnessed so many failures over the last 35 years due to 'modern technology', wonder adhesives,some have been massive failures that have sent companies into bankruptcy , from the manufacture of tiles, adhesives etc ,and recently, now de coupling membranes have come under the hammer , had some of the slower out dated methods been applied the failures more than likely would have been eliminated. Similar projects done the old way are still there as testimony to the time tested methods. It could be said that the problems lie with the fixing. very true in some cases, but not always, so to be honest, I look at each project, and the best way to eliminate potential problems, if there is no modern equivelant way to complete the job , take the 'old ' way, so Im of a mind that if its not broke dont fix it, if alternative means taking a step backwards, then so be it.