It seems to me that some of the answers (not questions themselves) are too localized to the United States.
One example is When should a waterproof membrane be installed for shower tiling?, where a membrane is recommended with an assumption of a backer board present.
Backer boards, drywalls, lath and plaster walls are all quite uncommon in at least some parts of Europe - brickwork and concrete are materials of choice, with drywall occasionally installed for interior remodelling. As an illustration, I never heard of a wall stud until some reading on this site.
What is the general opinion on that?