Yes specifically want to add a big vote for this. Comments going to Email is some basic functionality it would really be great to get in Fibery soon. It is a really basic need.
I have just posted a separate request specifically around this that is a bit different, but around the same theme.
but it is also absolutely a basic functionality to be able to respond to comments directly from Email. I can’t think of any marquee productivity app that doesn’t have this as a basic feature.