Hot take:
A team absolutely should go through a new OC every year until they find the right one. If you know it's not right, don't stick with them any longer than you have to.
Your young QB's development is too important to waste time holding onto the wrong cards because fans and analysts think it's taboo.
At some point, if you keep making the wrong OC hires, there need to be consequences for the head coach, true. But I keep hearing people say, "If you pick the wrong OC, you're stuck with them for at least a few years." No, you're not. Get their ass out if they're not right for the job.