The world map is changing: The UN has backed replacing the 500-year-old Mercator projection with the accurate Equal Earth projection
(thelemmy.club)
The only reason to have a default map is political.
People actually using maps and GIS pick whatever projection suits their needs - which is not Mercantor most of the time to begin with. I work with GIS a lot and never use it, unless forced by some API. But even then, reprojecting is trivial.