I'm really disappointed by how bloated the lemmy frontend has become. Like, if they just cut the hyperlink preview/embed features that nobody needs it would already be a good bit lighter. There used to be an alternate lemmy frontend that emulated being a phpbb forum that was unfortunately abandoned: https://github.com/LemmyNet/lemmyBB
Also there is lem.el for emacs which works but it's kinda basic and rough around the edges.
Honestly, if I was in charge of lemmy it would look basically like the site linked in the OP. And I'd also think about making it accessible from gopher/gemini.
Hey, I'm posting this via lem.el! I've been using it for a few months now.
Could still use some work, but far better than using a Web Browser.