You needed to say these things before separating from your employer. In fact, you needed to say these things as they came up, rather than letting them pile on and form into a huge rant like this. I'm actually having a hard time following each and every point you have, even though some of the ones I can pick out seem pretty valid. It is overwhelming, and overwhelming usually means nothing is going to get done, because no one knows where to start.

I agree with the other comments so far that this shows a certain degree of passive-aggression which isn't particularly appetizing.

However, I will strongly disagree with the point in a couple of the other comments that the acceptable alternatives are: shut up, do as your told, and detach from your job as much as you possibly can while still performing it; part ways politely without indicating anything was ever other than you expected it. These take an adversarial stance that you and your employer have nothing more to offer one another than what was strictly agreed to as the job duties and wage, and that any such attempt at offering will only result in bad outcomes for the weaker party.

When did we get so fucking bitter and jaded? And when did we decide that this outlook was optimal? I honestly wonder if this sort of attitude contributes to polemics like this, because we insist that people have an seemingly infinite ability to remain stoic and bottle their frustration. The alternative of trying to separate emotionally from a job never, ever works. Doing bullshit for eight hours a day to fund eight hours of "recovery time" is not zero-sum; the effects are real, as much as people want to blame those effects on the mere state of being alive. You are not preprogrammed to be depressed; this is not a least-energy state!

The other option is to quit, but employees usually don't until the get to the polemic-spewing boiling-point of their frustration. It sneaks up on them, because they've been bottling it so long. Writing it and then deleting it is therapeutic, but doesn't accomplish anything. The next job will likely be the same, like a self-perpetuating prophecy, because a lot of employers suck, because a lot of employees within are trying every day to convince themselves they don't care. This is least-energy for the employer, not the employee.

If you really want to step off this cycle, perhaps it is time to admit what you've known all along: you do care what you are doing 8 hours a day, and who you are doing it for.