If you wish to maximize A, you will need to lower your standards for B, C, and D. This is the nature of any selection process: choosing a home to buy, breeding crops, writing legislation, etc. It us no less true for hiring employees.

There are a very limited quantity of perfect employees, and you are unlikely to ever have the opportunity to hire one. The vast majority of employees have a mixture of good qualities (e.g., being hardworking) and bad qualities (e.g., expecting a higher salary). Your best strategy is to prioritize those characteristics that are most important to the role you are hiring for and be flexible on characteristics that are less important.

If you get your priorities out of order, even if inadvertently (e.g., by asking unverifiable interview questions that select for better liars), you will make suboptimal decisions.