Building consensus is just one management style. It is by no means the only one, or even the only effective one. It's not unethical to manage in a different fashion. The people being managed don't like it, but that doesn't make it unethical. Just find a better job.
Checking out and doing what you're told is a rational response, one that management would not be opposed to seeing. You're still getting paid the same, but are having your responsibilities taken away. Most other people are overworked and underpaid, you're getting underworked and overpaid. So why complain?
Being able to come into work, do a job, and go home without having to be worried about the outcome of your efforts, to have someone else on the hook for it, that would be looked at by a lot of people as a luxury. But devs all seem to have this ego that keeps them from being able to appreciate the reprieve.
Yes. Check out mentally. Do your job and go home at 5 and do all those other things in your life that you've been neglecting because you were putting that energy into your job. Spend time with your wife and kids, date if you're single. Work on your hobbies. Enjoy it because that's not going to last forever either.