actually you would want your system to react at the speed of its input (the world as seen form its point of view), not at the speed of its clock. And if you act

actually you would want your system to react at the speed of its input (the world as seen form its point of view), not at the speed of its clock. And if you actually wanted a clock (say for an alarm clock in the morning), you could still input a clock to your system, that wouldn't entitle gating the whole system and having clock domains and that stuff.