Why Fewer Senior PMs Might Beat Any Ratio, and Perplexity Goes Multiplayer

Perplexity's Computer product just became a multiplayer agentic OS with persistent memory and shared sessions, which is a bigger product leap than a typical feature drop. Meanwhile, a CPO at Whatnot is making the case that the whole PM org model is broken, and Lenny published it. Both items are pointing at the same underlying tension: what does a PM actually do when AI handles more of the execution?