I believe there's only One way to do a job- THE RIGHT WAY.
It never fails to amaze me at how many jobs I have been hired to rip out and redo because they were done incorrectly by 'general contractors' and 'handymen'. Unfortunately, many professional contractors that I've met seem to lack the knowledge of the proper installation techniques for tile and frequently use incorrect materials. In order to gain knowledge, one must study proper technique and be familiar with all the tile settings products out on the market today. If a contractor isn't setting tile or doing bathroom remodels on a daily basis (because they're a general contractor or a handyman), they simply don't don't have the opportunity to become a bathroom & tile specialist.
It's a simple analogy, but I feel it's appropriate. If you were suffering from a specific disease or condition, would you go to your general practioner to treat it, or would you go to a specialist?
In many cases, contractors and new house builders just do the minimum amount of work and use the cheapest materials in order to make a higher profit. I'm a bathroom specialist and I do the job right the FIRST time because I stand behind my work. My work strictly adheres to the guidelines set forth by the Tile Council of North America (TCNA), The National Electrical Code, the International Plumbing Code and the National Building Code. Years later, the only reason I want a customer calling me back is to do more work for them.