I'll explain this with a example: I have jolly machamp and I teach it elemental punches spending alot of cash in shards, then I notice adamant is better and re-breed it
result = rip 75k for each punch and I dont find it fair, on the old breeding it was right because ppl would simply pass down moves like substitute and there would be no point in using tutors, but not right now. they should be passed by mothers only to keep people from catching wild male pokemon just to pass eggmoves