> The very concept of merit has been destroyed ...
It's the subversion of truth. I think that way of saying it is more accurate, addresses the consequences, and is less occluded by jargon: People care about truth; 'scientific expertise' may seem esoteric to most people.
I think HN is frequently part of that process: Merit - expertise, actual trials and evidence - is replaced both by sensational too-clever hot takes / takedowns, and by political/social advocacy.
Most threads begin with a takedown, a 2 minute drive-by from an amatuer, often of years of research by someone spending their life studying the matter. For some issues, we all know what side many will take before you know any facts or evidence.
These comments are normalized and given greater credibility than the OP and than valuable comments. How is that any different than the things we criticize (other than the FDA's subversion of truth [EDIT:] is far more consequential [sorry, I didn't finish that sentence!])
There are valuable comments to be found; maybe that's one difference, but I'm wonder how the signal-to-noise compares with other forums.