Does Riot make things too hard on themselves?

Here are the Ryze changes on PBE:

• Arcane Mastery (Passive) cooldown reducing effect is now 60/70/80/90/100% of Q's CD based on Q rank from 4 seconds / 100% of Q's cooldown, and spells that would reduce Overload’s cooldown instead fully reset it. • Arcane Mastery (Passive) stack duration lowered to 8 seconds from 12 seconds • Arcane Mastery (Passive) supercharged duration down to 4 seconds from 6 seconds • Overload (Q) damage changed to 60/95/130/165/200 from 65/95/125/155/185 • Overload (Q) mana cost changed to 40 at all rank from 30/35/40/45/50 • Overload (Q) new effect "Arcane Mastery's cooldown reducing effect is increased to 105/110/115/120/125% of Overload's cooldown" • Rune Prison (W) cooldown increased to 22/21/20/19/18 seconds from 14 seconds. • Rune Prison (W) root duration changed to 1.25 seconds at all ranks from .75/1/1.25/1.5/1.75 • Spell Flux (E) cooldown reduced to 6.25/5.75/5.25/4.75/4.25 from 7 at all ranks • Spell Flux (E) mana cost reduced to 50/55/60/65/70 from 60/70/80/90/100 • Spell Flux (E) initial damage lowered to 32/44/56/68/80 from 50/66/82/98/114 • Spell Flux (E) return damage lowered to 16/22/28/34/40 from 25/33/41/49/57

Couldn't just have done:

• Rune Prison (W) now gives the "Imprisoned" debuff for 6 seconds to champions it snares. If Champions with the imprisoned debuff are targeted by Rune Prison they are not snared and are instead slowed by 20/25/30/35/40% for 1.75 seconds

This seems to fix the permasnare problem while leaving the rest of his kit and play pattern in tact. If he is still too powerful after that change, it should just be a matter of adjusting numbers.