An item that increases projectile speed and animations

What if deathcap decreased animation times and increased projectile speed instead of multiplying ap? I think it would make deathcap much more interesting.

I was thinking that theres three parts to being a mage. Dmg. Cooldowns. Skillshots (projectiles). Combos (animations). Why do mages get to buy dmg and cdr but dont get to buy projectile speed and combo speed?

I think this would balance mobility a little bit. If you are vs mobile champions, might be a good idea to sacrifice some dmg for a trade off in increased projectile and animation speed. So you can hit them.