I don't see the word "mobility" in "Empowered abilities and resource manipulation", can you?

So why the hell is Sorcery massively composed of mobility-based runes? One rune out of three is focused almost solely around mobility AKA movement speed, while ONLY ONE RUNE CONCERNS MANA (Manaflow band), representing resource manipulation. Why???

Everything the sorcery tree was made of smells like it was only designed to be a secondary tree for everyone else while it was supposed to be the pure mages' main tree. The only thing that gave an advantage for mage having it as a main tree was being able to synergise two other sorcery runes with Ultimate hat, but (GUESS WHAT) this rune has been ripped from Sorcery's body just to be fed to Domination, who gets all the attention along with Precision whenever changes needs to be made to the rune system ever since the Pre-season.

Just to make it even more ironic, Domination, who is about "Burst damage and TARGET ACCESS", thus focused around mobility, was the one who inherited of one of the most iconic runes of Sorcery just for it getting replaced by (drum roll) Nimbus Cloak, AKA a mobility-inducing rune that dosen't bring anything worthwile for an huge number of champions who were using ultimate hat. What.The.Hell is that logic?? :

Remove an ability-empowerement ability from the ability empowerement tree -----------------------> Put it into mobility-focused tree Then. Replace said ability by another one concerning mobility, who would've logically belonged to the mobility tree

"Oh yeah, I sure do enjoy having Movement speed while Ulting with ! Who needs increasingly smaller cooldowns for it, anyway?!??"

EDIT: People are actually arguing that Movespeed is usefull for mages...Well, of freakin course it does help them, just like with everyone else without exception... But normally, you should focus on such a secondary stat in, well, your secondary tree if you really want it. But since the whole Sorcery tree is designed as being a top choice as a secondary tree for everyone, it has a really bad impact on those who uses it as their main tree (thus, mostly mages) since they end up loaded up with plenty of secondary effects that they don't necessarily need or even use, while being forced to search for those who actually matter in the other trees since they are all spread evenly between them (Presence of mind, Ultimate Hunter, Cosmic Insight, etc etc).