I thought it has never been discussed before... 
Gang rating in Necromunda is used to determine the underdog, which in turn is used to balance the game through inducement/tactics cards. If two gangs are identical except one's rating is bloated because of injuries and compensating advancements, then why should they be considered the top dog? If anything, they should be the one to get inducement, since their player was bad enough to get their fighters injured.
As it stands, Neomunda encourages you to fire injured fighters and replace them with identical non-injured fighters as soon as possible. I think it's a complete non-sense, as encouraging you to keep them as long as possible would generally make for a more flavourful narrative.
Gang management should be a matter of credits, not rating.
Gang rating in Necromunda is used to determine the underdog, which in turn is used to balance the game through inducement/tactics cards. If two gangs are identical except one's rating is bloated because of injuries and compensating advancements, then why should they be considered the top dog? If anything, they should be the one to get inducement, since their player was bad enough to get their fighters injured.
As it stands, Neomunda encourages you to fire injured fighters and replace them with identical non-injured fighters as soon as possible. I think it's a complete non-sense, as encouraging you to keep them as long as possible would generally make for a more flavourful narrative.
Gang management should be a matter of credits, not rating.