This is the worst kind of nerf possible. This makes absolutely no difference in lower tiers, because people hardly land their shots anyway, and it will make no difference in higher tiers too because people will learn how to use this anyway. A friend who plays Zen really well said he actually prefers the new Zen, since it’s easier to correct your aim after you start shooting, so now he lands way more shots with Zen’s alternate fire.
Just give it time. People won’t even remember Zen was nerfed in a couple of weeks. This means nothing, its just so Blizzard can say “we’re paying attention at the high-pickrate characters, look!”, just like DVa nerf (that also means nothing).