Difference between appraisal and resignation

A newly joined trainee engineer asks his boss "what is the meaning of appraisal?"
Boss: "Do you know the meaning of resignation? "
Trainee: "Yes I do"
Boss: "So let me make you understand what a appraisal is by comparing it with resignation"
Comparison study : Appraisal and Resignation
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In appraisal meeting they will speak only about your weakness, errors and failures.
In resignation meeting they will speak only about your strengths, past achievements and success.
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In appraisal you may need to cry and beg for even 10% hike.
In resignation you can easily demand (or get even without asking) more than 50-60% hike.
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During appraisal, they will deny promotion saying you didn't meet the expectation, you don't have leadership qualities, and you had several drawbacks in our objective/goal.
During resignation, they will say you are the core member of team; you are the vision of the company how can you go, you have to take the project in shoulder and lead your juniors to success.
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There is 90% chance for not getting any significant incentives after appraisal.
There is 90% chance of getting immediate hike after you put the resignation.
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Trainee: "Yes boss enough, now I understood my future. For an appraisal I will have to resign ... !!!"