Hashnode is a platform for user generated content. If you miss anything or feel a topic is underrepresented then this issue is not about Hashnode as a platform; it's about the community and what content users share, post and ask.
It's indeed not very satisfying when one joins Hashnode and seeks for specific content, but not many, or even no one has published such content here on Hashnode.
Attracting people to share topic-oriented content could be addressed by the marketing guys at Hashnode or the community motivates itself to share, post, and ask pretty much anything.