Whoops, this got buried among other cpunks threads because your mail client apparently supports "list reply" (of which I'm a fan, don't get me wrong), and Inbox apparently isn't smart enough to pop out threads I've replied to if they don't have me in the recipients list.
While I've been considering going back to running my own server for some time, I'm afraid I am currently using Gmail via the now deprecated/grandfathered free tier of "Google apps for your domain," which makes me feel like something of a second class citizen because it tends to get various products last, for example it does not work with Google Fi, and you can't set up a Google Play family account. Which seems idiotic since families seem like a pretty major use case for Apps for your Domain... but again, the free tier is deprecated :-/
Of course, I can't complain too much about it; it's already a huge problem in SIlicon Valley that we tend to build solutions that work well for us and far less well for the other 99.999% of the population. But it would be nice if we could figure out how to make something as important as an email address more portable for regular people by making it super easy to have a custom domain that you use for just yourself or your family or whatever.