Murray S. Kucherawy writes:

I don't have a reality suspension field in effect on this topic. I was simply disputing the claim that complying with the List-Unsubscribe RFC constitutes "hiding" of those details.

It's not deliberate, let alone malicious, but it does conceal the details from the user's view, both in current practice (where few MUAs -- at least weighted by user count -- implement reasonable handling of those headers) and in reasonable implementations of the RFC (as in the part of my post that you snipped).

I don't claim MLMs are broken in this regard, but I do think some more modern thinking by all components is in order.

I agree, and have no objection to advocacy, or to RFCs that take advantage of more modern thinking. But that's very different from arguing that a defect in the DKIM RFC is really a problem of the implementations.