&& Weirdness

fafhrd explained why it skips over one command to do the other. When you are doing dishes, do you take the dirty ones and put them away or do you empty the dishwasher, put the dirty dishes in and the clean ones away. Also do you put a couple of items in and then run it, or go "Hey, it still has enough room, so I will just put stuff in there until it is full and then run it."

Same way when you look at anything that has to deal with analytical thinking, which every OS is designed to talk between the kernel, every piece of hardware through IRQ's, telling programs and tasks if they need to run or wait, housekeeping does not need to be done, if the system is still running in fair shape and is not dropping below the percentage that the Software Engineers figured out at what point the system ends up having to go do some housekeeping to bring it back to full potential.