I'm glad to see IPv6 adoption growing, and that one of my home ISPs now provides IPv6 that the router I have connected to it autoconfigures without too much digging, but some of your points aren't meaningful to a "non-technical end user", and some aren't a clear benefit of only IPv6...
My dad uses AOL (webmail, not dialup), he's younger than 70 but not by much.
However, my younger brother also uses AOL... about a year ago he got a gmail account, but last time I sent him mail at his gmail address, he didn't respond, and when I called him he said he hadn't seen the message. Then I re-sent the message and CCed his AOL account, he answered from there. So, I haven't seen the UI myself, but I'm sure it's "good enough". He's hardly a tech newbie; has a BS in physics, currently in grad school.
+1 on the self-hosting. For outgoing e-mail there are various "email send" services aimed at transactional e-mail from cloud-hosted applications but that are easy enough to point Exim or whatever at. For incoming I guess it would technically be "running a server", and might be iffy on dialup, but I've never used an ISP that actually blocked incoming port 25.
Man is the best computer we can put aboard a spacecraft ... and the only one that can be mass produced with unskilled labor. -- Wernher von Braun