Time exists as a dimension to many parts of the game, and it's important to establish this framing: that in general if you contract time, you lose something of your ability to react or respond to your opponent's actions. Maybe this is vague, but I think that TheDwf was talking in prophetic terms: that Blizzard foolishly ignored a fundamental rule and will have to pay the consequences.
Except you could argue that the more time you give players to react the easier it becomes to make the right direction. As an example, I can probably calculate in my head what 28*36 is if given enough time, but I can't calculate it in 5 seconds. Only skilled math-guys can.
It simply doesn't make sense to argue that less time as a general rule reduces skill. There are lots of other variables that matters here. It must instead be analyzed on a case-by-case basis.