I enjoyed league a lot more before keystones came about.

Perhaps an unpopular opinion but honestly I find keystones add nothing to the game besides raw power that, I find, is completely unnecessary. Keystones feel more cheese than skill. They make champions that shouldn't be bursty, bursty. They give the potential to one shot you with just her ultimate and 1 Q. My personal favourite is being hit by a jhin Q only to take the same amount of damage in deathfire touch. Or having that pesky mage auto fly across the map and hit you and killing you as it procs thunderlords. Or having that headshot you for 100000000000 damage with fervor. Or being one shot by that as you try to burst her as a mage but are unable to because of warlords.

All in all I believe that keystones are here to stay, but I don't think they are a healthy part of league in any way, shape, or form