I think hackability can go a long way towards this.
Especially on the frontend, there’s no reason Lemmy shouldn’t have custom “plugins” to change its behavior in certain ways. I think the issue isn’t that the Lemmy developers don’t want these things to exist that you’re talking about, so much as them being the only ones in a position to make the changes or accept the PRs to make them happen. Of course in that situation, change will be slow and progress limited.
Me making changes to the frontend that intensive, or anything like it, was a bigger scope of change than I was expecting. I just wanted to make some tinkering things for my instance. But it wouldn’t be impossible. And you could have your charts. Even little blinking lights and things.