You probably couldn't explain how you walk, or how you cook an egg, or how you speak English, at the level of detail that would be required for something like this. Yet you do know how to do all those things.
Just because you can't write down detailed objective instructions for how to do something does not at all mean you have no idea how to do it.
Should we not require any due process under law, because the officer "just knew" that it was that brown guy who stole the bread?
What's being asked for is accountability for decisions that can literally result in someone ending up homeless—and that are hugely subject to bias, both conscious and unconscious, in a country that is currently riven by divisions of race, gender, sexuality, and class.
Maybe we're balancing the wrong side of the equation? Expanding teach-to-the-test across the economy strikes me as the wrong move.
This is a bit fallacious and a false analogy. Due process under law exists because it's definable. We have standards for evidence, burden of proof, reasonable doubt, etc.
The challenges in cleanly defining what it means to be a "good employee" don't somehow mean other aspects of society that can be defined shouldn't be.
I think almost everyone has worked with someone who they know shouldn't be there, but they still are because they keep finding ways to technically meet the letter of the law when it comes to "performance". And yet they are clearly a huge anchor for the team, and everyone knows the team would be better off without them.
I wish we could perfectly evaluate what it means to be a good employee, and we could show the exact measurements used to do so. But this simply is not realistic, never has been, nor will it likely ever be. The spectrum of possible behaviors and the intricate interplay unique to various teams makes such a task impossible. I'm not saying an effort shouldn't be made, but that these decisions are often highly subjective, without much hope of arriving at something more objective.
I've worked at places that had stringent requirements for firing people. The net result was that good people all leave voluntarily instead of being stuck with the problem individuals, ultimately resulting in teams full of mediocre-to-awful teammates.
Managers can both know how to evaluate quality and fit while not having any hope of perfectly defining and documenting those evaluations. I'd rather work in an environment that has at-will employment with all of the downsides that come with that than a place that can't fire employees without spending a year creating a mountain of paperwork that ultimately doesn't get anyone much closer to the objectivity people are striving to achieve.
Remember that homework assignment or group project where you spent an inordinate amount of time and effort on not doing the work as intended in some silly way? This is the adult version of that.
The same with students who'd go to great lengths to cheat, rather than spend a few minutes learning the material.
Either the company should be able to evaluate an employee's performance and therefore can show proof of poor performance or it can't properly evaluate an employee's performance and therefore shouldn't be firing people based off an admittedly inaccurate measure of performance.