It's remarkable how stable 20-30% show HN concentration is after late 2022, for the extended stats.

The Show HN volume went 805/month to 4,199/month over that same time period, so from 3.2% of all submissions to 13.4%, while HN overall only grew 1.3x. So the flat ~24% held through a 5x expansion in the denominator, which makes it a lot more interesting honestly.