For most aspects of living our lives, using a logical approach delivers much better results than taking an illogical approach. Performing certain tasks in a methodical, step by step approach only makes sense, especially in cases where you are taking specific actions to reproduce a certain result over and over again.
However, the process we refer to as keyword research is one place where we can benefit by taking more of an anything goes approach for research. If logic rules in your research (which for most of us it naturally does) then you often discover the same keyword phrase rends that any other logical person might be guessing at or researching.