I haven't really noticed. Doesn't seem like HN has changed very much.
Edit: Clearly the topics have evolved over time (AI, crypto, there will always be some topic taking up the majority of attention), but the type and worthiness of content seems unchanged.
Compared to two years ago? HN was never this overstimulated on AI. It's pretty high. Even when Crypto was at its peak I don't think it ever dominated the HN front page to this extreme.