That’s because it makes sense when dynamically creating HTML. HTML is not a programming language, it’s simply markup - so if you want to generate some block of HTML in a loop and later access that block of HTML in JS (e.g. to interact with the UI separate from creating it in the first place), it’s a completely reasonable thing to do.

TS is “better” but often I feel like just configuring typescript takes up a significant amount of the time you save by using it.

There’s nothing to stop an admin from hosting a static front end for their Lemmy instance if they’d rather, but it’s clear that SSR is a goal here - and I think the default UI for Lemmy really should include SSR for plenty of reasons. And, if you’re already hosting a Lemmy instance, you definitely already have a host that can support Rust (at the very least, in a container).