Of course, and part of my reason for being brought onto the team full time is to explore ways we can develop HN for the future. That doesn't mean that every 3rd-party HN project represents a feature that should be added to the core HN UI.
I didn't know, and I thought only @dang was working on HN. You must agree that at least some basic features, like a dark theme and indicators for new comments, could be easily handcrafted or implemented with coding agents!