Let me remind you of recipe websites as an example of how summaries can be better by ignoring all of the useless crap that has nothing to do with making the dish
I find that if I describe an esoteric bug to a high powered LLM, I often get to my answer more quickly than if I trawl through endless search results. The synthesis itself is a valuable addition.
Frequently I cannot even find source documents which match my exact circumstances; I’m uncertain whether they actually exist.
That is a big if.
A summary cannot be better than what is summarizes in any was but brevity. It can be much worse.