I agree, I would not recommend this practice.
My root canal and crown had to be completely removed a little over a year from when it was performed. My current dentist (in boston) informed me that in many instances these two procedures are performed when a tooth extraction should be done because the dentist can charge more money. Not only was the quality of their work very poor, but it cost me a lot of money too. I do not wish for anyone to go through what happen to me as a result of poor practices.
I definitely do not recommend design in dentistry.