On several occasions I would have ended up writing a multi-page resume as well if recruiters/job ad websites hadn't told me explicitly not to do so. One easily

On several occasions I would have ended up writing a multi-page resume as well if recruiters/job ad websites hadn't told me explicitly not to do so. One easily ends up worrying that you need to show off a tower off knowledge. For my next job hunt I definitely concentrate on the things relevant for the kind of thing I'm looking for. Especially adding bullets about things one dislikes backfires eventually after taking a position. At some point one will get asked to work with exactly that stuff because nobody likes doing it