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Old Account
If you use the durabse matt it won’t crack as it takes expansion off... never had any issues neither my mates. Tanking, needs to be at all times. I would always use marmox boards, Schlüter or similar products for the shower areas. It might be a little bit more expensive but the results are better.All those floors will fail I'm afraid, ply expands and contracts throughout the year, leads to hairline cracks over joins, cracked grout and tiles debonding.
There are a few cowboys still tiling on ply but they are still probably priming with pva, you need to tile on cement backer boards or foam cored stuff.
Niche is a recessed shelf in a shower to put shampoo and stuff.