One of the reasons I stick with Big Email for my primary email is cases similar to this. If I host email and lose the domain one day, I’ve lost two factor on a thousand different services (the single factor on some). Big Email’s policy is to not reissue my address, should I lose it or die. The .name scenario is even worse. One domain gives you access to tens of thousands of users email. It seems like a privacy nightm…
You can look through my history how many times I’ve brought this up to people and they just don’t seem to care. A defence is that they’ll buy the domain for a century and not care once they’re dead which is fair but the situation in this article is a valid one. I will always stick with Big Email for accounts.
(Update: as it happens… https://news.ycombinator.com/item?id=49548452)
Personally I like having a custom domain as I like the idea of being able to move between providers. So far, over the past decade, I've hosted my email with Google, Fastmail, Hey.com and then Fastmail again. I like being able to move it around if I find one provider better than another. Others won't care, that's fine too.