I was gonna make a post on this, but glad to see I'm not alone. I agree with some traditionalists that having no repercussions would make this a game breaking spell. In the multiple runs ive done with Friends it seemingly never failed the Charisma check. It was also annoying when you dont realize why the game is feeling bugged like why is everyone so hostile and having a whole faction at times attack you for just having the friends spell active not even if that you casted on them. Lot of reloading which was not fun. I think the simplest solution is to make friends either less of an attitude drop that leads to violence straight away. Maybe if you get "caught" only have it be the recepient who can confront you and the game gives you a good 10 seconds to get out and dodge, so ideally not to be used on re-curring npcs/factions or companions and if youre gonna use it, use it when you really need to ala "Illithid Powers"