Why do you think I needed to? The phrase "a lot" has an established meaning in the English language.
> or mention which topics in philosophy you think are legitimate
That's true. I was writing an HN comment, not a review paper for submission to a peer-review journal. But it doesn't take a lot of imagination to notice that my comment was made in the context of a discussion of an article entitled "Silicon Valley misreads science fiction and undermines democracy" and to infer from that I was referring to philosophical topics popular among silicon valley tech bros. The specific topics I had in mind are mainly political and economic theories, which not everyone considers philosophy. But I'll point as an undeniable example the work of Curtis Yarvin a.k.a. Mencius Moldbug who, rather incredibly, attracts a huge audience by advocating for the divine right of kings, among other absurdities.