Also depends on filters set in NOTAM. Incorrect settings are often reason why filers allow them to be displayed even if unnecessary for flight crew.
Filtering duplicate notams when briefing packages are generated is another reason multiple identical notams may show up in one briefing printout.
Best way to move forward is electronic notam administration, with visual clues to crew what notams affect their flight. xNOTAM have been worked on and are being improved for a long time now, time to put them to good use. In an EFB environment the crew should be able to see NOTAMs by selection and the amount of NOTAM would no longer be a limitation, moreover it would enable crew to see NOTAM for e.g. diversion even if no such NOTAM are available preflight as airport may not be included initially for briefing.
Current paper amount of NOTAM are too much, but reducing its content and amount requires work from all parties, those writing the NOTAMs to correctly set flags and understand the limited capacity crews have to digest all information presented preflight, those generating NOTAMs briefings to ensure correct filters are set so not to overindulge crews with information which may be trivial, those reading them to be able to report back on briefing packages so to work on improving the information contained within.