I never observed full morale being bad. My opinion is, morale has a little influence among many parameters, so it cant be proven as stand-alone. For important games I push it to the maximum, just a guess. I mean it would be sooooo silly from the devs, bringing this visible moral system which is super easy to implement (just giving 1%, 0,5% or whatever), but not implementing. Its almost no work to programm it, on the other hand why risking it that this fake would come out one day