As Major said, Member sharing is important in Discovery.
Discovery has a knack of producing OOC hate out of RP encounters, this is due to us being human unfortunately.
Member sharing allows people to alleviate such OOC hate usually as they have often been on both sides of the RP situation, which removes a lot of the potential bias or hate that can build up over time.
Factions throughout Disco's history have attempted to avoid member sharing, only to find it often poisons their faction from the inside and usually results in a lot of OOC hate inside it.