@Riot, Riven.
The Riven changes seem to have the goal of making her high end more accessible, so that more players have access to her maximum power, but also reducing that power.
https://twitter.com/ricklessabandon/status/649377861099474945
In essence, they are intentionally making Riven easier to play, which is, as you might imagine, sitting there, sipping your orange juice and wearing your "Riven Mains are the scum of the Earth" shirt, bad. Very, very bad.
The change will reduce Riven's complexity, making her more linear in her trades and how she fights, making animation cancelling detrimental to her damage, and thus punishing her player for playing well, and due to this, will force one of two things to happen:
- Riven is bad, and Riven stays bad. This is a bad outcome.
- Riven is good despite the loss of complexity, resulting in a much more powerful champion in the hands of the inexperienced with no net gain for the very experienced players. Also not good.
The key big why here is the change to her passive. By allowing it to only stack once, you pigeonhole Riven into auto attacking much more frequently, delaying her burst substantially or losing a lot of damage, meaning that she will become very straight forward, particularly in lane. New Riven is predictable, and compared to old Riven, boring and with a lower skill floor and ceiling. Which you might imagine, as you sit there, drinking your wine and wearing your "I farm upvotes" shirt, is bad.
This is bad for everyone. It is bad for her players who are losing a great deal of what made the champion a joy to play; her complexity; and the people playing against her who will now have nearly as much to fear from a mediocre Riven as an actual good one. The difference in current Riven is huge, in the new one, it won't be.
Additionally this will hurt her already weak team figth capability, since like Fury you need it to be effective, and Riven has no way to build edge before a fight, and will die in a fight before she can generate her edge. This is another issue entirely to the entire problem of the redesign, however.
EDIT
https://www.youtube.com/watch?v=k1UfGvq9A-8&channel=albertsunzheng
Box Box seems to feel the changes make her strong, but not more fun to play, and more annoying for enemies.