I hope next season or after they unlock runes to make them more custom
Right now we're locked into two sets, a primary and a secondary. What I hate most is how limited we are in our choices. For being a 'customize to your playstyle' it really doesn't. There's one good rune for your champion, and you're stuck taking whatever is down that line. Then you choose a secondary that most fits your champion, and you're stuck taking the leftovers in that line.
In the future I hope to see them fully unlock runes. Where a Soraka can take Aery (almost required), Revitalize (REQUIRED) and then take something for herself. Maybe Ingenious Hunter, or Cosmic Insight. A time when the game is truly custom to your playstyle.
I know it would be weirdly balanced for a long time, and people would likely just take all stax-on-kill runes. But right now...it's so stale it should just be champion locked.