If keystones were only about utility they would likely be easier to balance
and more diverse in what is used.
Take a look at Stormraider's and Windspeaker's
When was the last item you saw either of these 2 masteries being reworked, nerfed or buffed?
They are about utility and they are arguably the most balanced of the keystones in that they are used but not found to be breaking the game or give players an unfair advantage.
Riot perhaps you should stop making keystones about damage or massive shields and instead make all of them all about utility instead.
Example being a defensive mastery reduce the enemies movement speed by 5% (half of this for enemy melee) stacking up to 4 times for every ability and auto they land on you. This alone might be enough to make people think twice about going ranged top lane.
Utility is diverse in who will use what but when damage is against damage the highest damage always wins.
