This strikes me as a tremendous overreaction and mistake which fundamentally changes the game in a way that the people asking for it have never appreciated.
Here are some advanced gameplay tricks I use daily as a Rogue which depend on spell batching:
Vanish immuning PvE mechanics such as Nefarian’s fear
Batching Blade Flurry backstab procs when a mob is positioned just out of blade flurry range, by strafing into range of the 2nd mob after each Backstab.
Gouging Blinks in PvP
Vanish-immuning incoming abilities in PvP (blind, deathcoil, etc)
While so far all of this sounds like complaining about nerfs, in fact this change will be a massive PvP buff for Rogues (a class which doesn’t need it) while also significantly lowering the skillcap and eliminating the advanced techniques which keep the class fresh and challenging 16 years later.
In particular, the massive overreaction to the batching window will mean it’s possible to Restealth off of (improved) Gouge and your opponent can’t batch an attack right as they are coming out of Gouge to deny the Restealth. It’s also a large buff to Vanish by making it harder to batch a spell on Vanish and break the Rogue out.
This is a horrible mistake and I’m extremely disappointed to see Blizzard giving into the whiners and crybabies and taking us further away from authentic vanilla WoW gameplay.
There is a fundamental misunderstanding on the part of the players who are asking for this change: they think WoW is about reaction. In fact that is wrong, WoW is about prediction not reaction. WoW has always been a rather slow and not tremendously mechanically responsive game. And I hate to be the bearer of bad news, BUT, if you died because the ability that would have saved you got batched, the error that got you killed is not that you weren’t able to react fast enough, your problem is that you didn’t understand the situation well enough to see it coming and be prepared.
Fundamentally, these players have failed to understand that WoW - a game with a 1.5 second GCD for most classes - is a turn based strategy game, NOT an action game where blazing fast reaction should matter.