I consistently get the impression that Gemini is better at sorting through the trash than whatever ranks SERPs these days is.

(Obviously far from perfect, often far from even good... just better.)

Which is not a good look for the Search teams/execs.

The summary isn't limited to the top 10 search results as sources so it need not be only based on blogspam like the first page of search results is/was. Whether or not it's actually better or not is still its own debate beside that point though.

Because the summarizer knows what blogspam is.