Lobsters is too focused around PLs, systems coding, and FOSS politics for my tastes. The content in other computing niches is just too cursory to be interesting.
That is true. I think it's because of the small community. I am working on something with a friend so I can apply similar filtering to HN. HN has a good mass of people and some smart people but it's got a lot of repetitive LLM-style content. Once it is done, I think I shall be happy.