All these factors are important in making a decision. So why would anyone think you should limit yourself only to #5 when hiring a new employee? Doing any of the other factors amounts to ‘favoritism or other nefarious motives. One could argue that #2 is the most important factor in the decision. People we trust and know will give us recommendations if they have had experience with something similar to ours. This is how you select candidates for a job.
Although the resume or CV is essential, it does not make up the majority of the decision. Your’spec sheet’ (on paper) will make up between 10-20% of the final decision. It is mainly to ensure that the minimum specifications are met. This is why I am focused on the entire process and not just the resume/CV.