I doubt many people besides Google executives really want Google to summarize your search results.
Today I heard my wife ask our HomePod which US state was most similar in size to Germany. First, I was absolutely shocked that it gave a useful and correct answer. Well done, little dingus, and sorry to have doubted you. But more relevant, her goal wasn't to do a search. Her goal was to get an answer.
For the most part, people want an answer from Google, not a list of pages that might potentially answer them if they're lucky. Sometimes I do want to see a long list of results I can skim through for the most likely answer, especially if I'm looking for technical details on something. But if I ask "how long do I bake a frozen 20 lb turkey?", I really just want a correct answer.
So maybe people wouldn't actually say they want Google to summarize their search results if you phrased it exactly like that. But I bet most people, most of the time, would say that they wish the thing would just look at the 437 pages of results and tell them the answer.
There's a lot of skimming and scanning that we've come to expect as part of the process in locating a piece of information, and we do it quickly with practice, but that doesn't mean it has to be that way.