Agreed, I was a bit confused as to why all of physics is such a blatant outlier. Maybe big experimental physics (e.g. LHC) with their 150+ author papers?
yeah but there are so many types of physics, theoretical and experimental, as well as physics that blend into other fields. Seems like a big field to leave out?
regardless, my guess is one could easily control for author sizes of team science papers, or filter them out for separate analyses.
maybe there’s some special authorship culture in physics that warrants this.