I think it's worth as a long-term goal for the Fediverse to entirely separate the "view" aspect from the "content" aspect of platforms where reasonably possible
This perfectly describes my ideal fediverse, too. Pretty much everything we're doing here is posting text; it can be a comment on someone else's text, or a comment on a video, or a top-level post in a community, or a top-level post on your microblog (which is basically your own community where you're the only top-level poster). IMO the type of fediverse server you choose should be based on which one has the best UI for the viewing and posting you'll be doing most often, but they should all be able to show everyone else's content as much as possible.
If I need to, I'll create separate accounts for separate interests, like one for games and one for professional things. But I'd like to use the same account for following indie game developers (on Mastodon) and gaming communities (on Lemmy) and commenting on game review videos (on Peertube).
I'm hoping that this will "just work" when Mastodon gets quite-posting. You could take a Mastodon post, and then quote-post it into a community by mentioning that community's name.
This would create a separate thread of replies, which is good. A person shouldn't be able to suddenly thrust a bunch of community replies onto someone else's post. So basically it's what quote-posting is for, but sharing it with a community instead of just your own followers.