Why are you proposing meaningless nerfs? Did you get your ass handed to you then come here without the courage to really go much further into depth? I wonder if your guilt or a lack of chesthair in the face of the ahri fancult hurrhurr
Also lux didn't need nerfs. So she didn't get any. People kept asking so eventually they just went ahead and did it. Its not favoritism, its just that when you nerf mages it never works out the way you hope. That mage doesn't just go away and then they aren't a problem anymore, the entire meta changes because that champ was used against many others. After the meta shift something else became stronger and that champ was still played but they had to be played in less fun ways. Double depression. Double problems and half the fun.
Also they had to go back and buff lux again later which cost more time and manpower.
Again its not favoritism per se. But ahri was the champ that, at the end of season 2, inspired the direction Morello wanted to take this game in to prevent more boring kog/ori control type comps and 2 hour games.