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I don’t think the SPF / DKIM / DMARC stuff is overly complex nor the core of the problem.
It’s not the core of the issue, but the average joe that is a hobbyist self-hoster it will be.
IMO, the core issue is that there is no standard whatsoever. People just do whatever the hell they want with these records, pretty much. Microsoft and Google do it differently than each other, even.
The only solution for me is that we move on from email as a society.
Indeed, you are not wrong. Such is the state of many, many things.
I admit it’s easy enough to say, “let’s get rid of it”, but without a solution it’s meaningless to say and is just an ideology.