In what way is it 'shafting' Amazon to leave with stock options you have already earned and are perfectly entitled to? Personally I find it very useful informat

In what way is it 'shafting' Amazon to leave with stock options you have already earned and are perfectly entitled to? Personally I find it very useful information to know the real implications of Amazon's PIP process, as I'm sure would many other less savvy/experienced employees for whom getting fired despite being perfectly capable must be a very difficult experience.