COST Ground Fault Protection. any breaker over 1000 amps on a Wye Requires it. If you can get your breakers under 1000 amps its not required.
30yrs ago I often designed services without GFP for installed cost reasons, now I wouldn't think of it. If ground faults are common in your facility then add a second level of GFP like they do in hospitals or use a high resistant ground scheme instead
Having a single main device, especially if it is in a barriered enclosure or a separate enclosure, makes reducing arc flash incident energy levels easier as well as providing a convenient means to disconnect the service for de-energized work.
