This doesn't make any sense. Apple has long shipped MacOS with everything included. Compared to the 12! Windows 10 editions (Home, Pro, Pro for Workstations, Enterprise, ...) MacOS is a cakewalk, particularly since Apple ditched charging for upgrades years ago.
> serious file manager
Huh? Finder is decent, pretty much anything it can't handle is probably best served with a proper scripting language from the command line regardless. I'm not even sure what alternatives to Finder are out there.