Here's the thing. I'm a mod for a small-time community for a niche interest, !castles@lemm.ee I'm also on Mastodon, and was before my Reddit exodus. I follow #castles as well as a few other related topics on Matsodon, so I get quality toots, such as this: https://mastodon.scot/@McNige/110926238926867959, that I wish I could just crosspost over to my community. Currently, I have to repackage the toot, which isn't a huge problem, but currently I just drop them a note on Mastodon that their content has been posted elsewhere on the Fediverse. What would be nice is if people who comment on the Lemmy post also get fed into OP's toot. More sharing, more connection, more activity.
On the flip side, I've subscribed to @castles@lemm.ee on my Mastodon instance and, while it's good to be able to follow posts in feed form, it looks like ass: 
I realize I should try this with Pixelfed, but I haven't made that leap yet.
I don't know, am I thinking crazy here? I'd think we'd want everything in the Fediverse soup interoperable in a more seemless way. Is this a feature request or am I missing some way to do this better?
He literally calls me out in threads every couple days because I downvoted something in his subreddit once.
It’s weird, creepy behavior. Don’t encourage him.
You got banned because you spam downvoted multiple comments without commentary, then continued the behavior after being asked to back up your downvotes with comments. You've escalated and continued the conflict by following me around the Fediverse downvoting my comments outside the forum - for over two weeks now. I will continue to call you out until your weird and creepy behavior stops.
You can play innocent all you'd like, but there's literally a public paper trail of your behavior, that any one can see by going through my comments and seeing the same two sad little trolls who downvote every comment they can.
You want me to go away, get the fuck out of my life. That's it.
You don't want to? Fine, I'll use your downvotes to call out your history as a racist, transphobe, fascist bigoted idiot again and again and again, because each time I do, folks are appreciative of being warned of your behavior, and I end up with new followers and traffic. Besides, I have no moral problem stalking a known stalker to keep them from harassing someone else.
This ain't one you're gonna win kid. Take a hint and your pacifier and go home to mommy.
I’m not playing anything. There’s a “public trail” of your continual harassment lol