That's a question for the Hubzilla devs. In Lemmy it's achieved through a special field where you enter the community to post to.
I'm not super familiar with Hubzilla but maybe it is just that way because Fediverse integration was added later. And they probably based their integration off of Mastodon where it's done through mentions in the post body.
Even when you stay inside Lemmy and create a post inside a Lemmy community that post is first created on your server. And then announced to the target community's server.
Like, if you had an account on lemmy.ml and wanted to create a post in fediverse@lemmy.world. You would still create that post on lemmy.ml and only after a short delay would it appear on lemmy.world.
Hubzilla does something similar. The post has to first exist on their own server before it is copied over to the community's server.
It's the same for Mastodon posts. Or Wordpress posts or a myriad of other fediverse systems. The thingy is first created locally and then copied to other services that are listening by whatever means.
There's a Stephen King short story about a woman obsessed with finding shortcuts who ends up finding a route between two places that is shorter than their distance.
For all its flaws and spaghetti code vulnerabilities in WP core have been really really rare. It's usually some plugin that's vulnerable. And automatic updates take care of timely patches.
It's certainly getting there. It's being memed like crazy on corporate social media. The two reviewers I've heard talking about the movie had their viewing ruined by stupid teenagers talking throughout the movie in the theatre.
When you separate them into different databases you add the unnecessary steps of having to remember where you put it. And when you create the password you have to decide how to sort it in. And what happens when a less important thing turns out to be quite fun and you'd promote it from less important to hobby?
Just save the passwords with the URL, name and maybe a descriptive tag or two. Let the password manager deal with bringing up the correct password.
That's a question for the Hubzilla devs. In Lemmy it's achieved through a special field where you enter the community to post to.
I'm not super familiar with Hubzilla but maybe it is just that way because Fediverse integration was added later. And they probably based their integration off of Mastodon where it's done through mentions in the post body.