The future of search is probabilistic, the past was deterministic
The big picture difference between classic information retrieval (what governs the 10 blue links) and generative informational retrieval for the web (what governs conversational search) is that the former is deterministic and the latter is probabilistic. In short, this means that the old version of Google displayed content the same way you delivered it. The new version of Google makes a lot of choices about how content should be considered, stitched together, and displayed.