Rune rework will likely have game-breaking rammifications to playstyle diversity.
I know it's too late to have any impact on the changes that are forthcoming. but from what I know so far the new Rune system is could really destroy a lot of players play styles and their diversity.
It's all well and good having a new system that grants + AD / AP every 10 minutes, free dashes, credit buys etc etc but the unique-ness that the rune system brought into LOL that gave every player the ability to 'personalise' their champion 'their way' is going to be lost.
For example a riven may opt to replace MR glyphs with AD for more burst. A Garen may replace Glyphs with Cooldown runes for Q poke. A Rammus replace Marks for Armour runes. A chogath health runes. It's this unique playstyle that gives our champions that 'personal' touch and though subtle these changes can make a lane counter manageable......winnable even.
I fear these new runes are just limiting diversity and shoe-horning champions to single playstyles. Everyone's going to pick set runes for set champions it's going to be so generic from what I know so far and this will also completely unbalance the 100+ champions exist. It's going to be a chaotic melting pot of broken champs, hot fixes, buffs and nerfs.
As well as all this though has the impact of losing these starting AD / MR / Armour runes even been factored into RIOTs equations? We have early and late game champs and losing these runes is going to completely throw that out of sync. Even the ability to farm and take minion and tower aggro is going to be massively affected.