There are companies with practically zero attrition rates and are successful; lots of companies can claim what you are claiming. Again, what you are saying is the same as "if I want to be taller, I should play basketball."
Then you should gather your own data and independently draw your own conclusions.
In my experience selective bias cannot be avoided unless you remove humans from the initial selection process. It is also my experience that potential in a given field is a predictable quality not discerned from resumes.
