Would also be great if the new comments would be highlighted.

There’s also pornlemmy.com. You don’t need to be logged in to view posts and there’s no anime/hentai or aigen stuff.

Use your instance’s search feature. You can search

• Name of community: No Stupid Questions
• By using !community@instance syntax: !nostupidquestions@lemmy.world
• URL of the community: https://lemmy.world/c/nostupidquestions

First option won’t work if your instance hasn’t federated the community yet. The last option is best in my opinion.

Lemmy.world is not yet 0.18, so that too might affect it.

It’s not a feature of Lemmy and, I guess, no-one has wanted to create it for their app. You should submit this idea to the Lemmy developers so it will eventually be a feature in every app.