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…
The risk of losing your big email account is higher than losing your domain. Furthermore, if you happen to lose your domain, it will in most cases be easier to recover than a restricted account.
I used to think this, until I inadvertently let a registration fail to renew because I didn't update my expired credit-card's billing details with NameCheap - they did send me automated emails about it but I missed them, unfortunately. Their grace-period is only 30 days and I didn't notice the problem until 45 days had passed when my domain-name was bought-up by a spam-site-scammer and redirected the site to a porn/virus-downloader site (yes, those still exist).
I paid $1500 (uugghhh) for the UDRP process to get the domain-name back ($1000 UDRP fee, $500 for the lawyer to do the paperwork), and the UDRP panel ruled against me: their response reasoning made it clear that they never actually looked at my submitted evidence - and unfortunately that $1000 is nonrefundable, gaaaaah. I still haven't gotten that domain-name back. (I will say that my previous other UDRP cases all ruled in my favour; I don't know why/how I somehow drew a crappy arbiter in this case, I'm just vexed that they can rule against me without any right to appeal; I expected better).