@Riot How Normal Cast could actually be made good
The GIF linked in this post shows the clear difference in how Attack Move and Normal Cast operate.
Attack Move: Press A ----> Press LMB (Left Mouse Button) ----> Auto Attack goes off
Normal Cast: Press Q ----> Press LMB ----> Release LMB ----> Ability goes off
So why is this important? Because for Normal Cast releasing LMB is pointless. All it does is add more clunkiness to Normal Cast. As you can see with Auto Attack it is much more responsive compared to Normal Cast.
The Solution? Make Normal Cast work the same way as Auto Attack. Just make an ability go off on Press LMB for Normal Casting. It's seriously that simple, this would actually make Normal Cast just as fast as Smart Cast except you also get the benefits of range indicators (hello Orianna/Ezreal/Diana/long range Lux ultimate etc). It's a win-win situation for everyone if Riot makes this change. The people who want to use Smart Cast can still use it and anyone that wants to switch oven to Normal Cast can reap the benefits.