Why are Mundra's the only thing that suffer from lag?

[Lilyarel]

I'd like to say, on good days, I can literally press the buttons I have assigned to mudras immediately with no lag at all and all of them will register in the right order and immediately. So you can rush it without screwing it up when lag isn't a problem.

Unfortunately, most of the time they do lag. But you can tell they are designed to be used as fast as humanly possible.

Makes me wonder they have the CD anyway. Why not just remove the CD? Theres a character in Dota who has a similar mechanic to the Mundra. Except his orbs have no cooldown and you can spam them as fast as humanly possible.