Giles Bowkett had a post a month or so ago pointing out the same thing. PG's response was basically that admin policing should cut off people trying to game the system with irrelevant content:
Presumably, he's hoping that by limiting the scope of the content, he can limit the number of interested participants and therefore the scale of the site.
https://hackernews.hn/item?id=196751
Presumably, he's hoping that by limiting the scope of the content, he can limit the number of interested participants and therefore the scale of the site.