Now that its Pre Season

Now that its pre season and all of these adc's got updates why not undo some of the nerfs to champs early last season, for example let Akali's e proc q again and undo the some of the nerfs to Sion and Sejuani, and perhaps give Talon's E a mini root or silence or something. Something for all of the champs who were once good but are kind of bad now.