Frozen heart should reduce only BONUS attack speed
Why? Because its screwing over champions who do not buy attack speed. Take tanks for instance Nautilus. Giant dude wielding a giant Anchor. Builds tanky cd to utilize his amazing cc. Why should he be punished because the enemy team decided to buy attack speed items.
What about supports like Sona who need to land the right powerchord? Why should they be punished because their team is building high attack speed items
Mages like Twisted Fate and Kennen who need to land a key auto attack with their low attack range to land their combo shouldn't also be punished for the same reasons.