Would you look at that! I just assumed that wasn’t a thing, since, @plumey asked like he did. However, as they would only be able to comment on posts with that user (non-techies won’t “connect to external blogs”), I still think a Mastodon user could be more fitting.
(My emphasis.
)
Micro.blog has several selling points - both from a user and business perspective. And one of them, is how well it plays with other services, both through ActivityPub, cross-posting, apps like Ulysses, Webmentions, etc. (I would never be a paying MB customer without this.)
I’d say making it easier to “collect” Fediverse comments (which it already supports), is part of “improvements to commenting on blogs”. And it’s well within Micro.blog’s wheel house, and not “improving Mastodon” or "tech support on behalf of Mastodon developers. Remember, what we’re talking about here, is making Micro.blog links better to open on the Fediverse. I’d say that is “improving Micro.blog”. And I think it also just happens to help solve Plumey’s wish as well.
Cross-posting to Mastodon, and Micro.blog’s ActivityPub support are two different things - and I was talking mostly about the latter. Let me explain (again
):
I have both a Mastodon user
@havn@mas.to
and my Micro.blog user is accessible through the Fediverse, with
@micro@havn.blog
.
I was talking about your family getting Mastodon accounts to follow your Micro.blog user directly - not your Mastodon account which you cross-post to.
Because, if they follow directly, they would get the “proper” Micro.blog post into their timeline - and if they commented, the comments could be displayed on your blog (if you want it to). But when you cross-post to Mastodon, it’s like copying and pasting the content of your post - and that creates a totally separate post. Do you see the distinction? 
Let’s say my parents are on Mastodon, and
@mom@mas.to
follows @micro@havn.blog
and
@dad@mas.to
follows @havn@mas.to
If I cross-post, my mom would get the “proper” post and my dad would only get a copy - and the they wouldn’t see each other’s comments. And only my mom’s comment could be displayed on my blog. So I like the idea of prioritising the “one true post” over making many copies that don’t “know about each other”.
So that is why it could be beneficial to have people follow @micro@havn.blog directly instead.