Is reply-via-email a thing in Xenforo 2.0?

No, it has been requested many times over the years but devs have their own priorities. There was an add-on for XF 1.x that worked well but, like many XF add-ons, it has been abandoned and was not ported to 2.0. That is why I am still on 1.x myself. I believe IPB may support this feature.
 
Sometimes websites may be blocked at work or too high bandwidth to load and email would provide a way to reply to posts.

Also some people just prefer email lists over visiting a forum.
 
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