The "at most all" is one of the most important block in Ardublock. At least if you use the Ardublock "experimental" from duinoEDU. In the "experimental" version there are no blocks like "scoop" or "count state change". Only with the "at most all" earlier "only every" is it possible to do without "delay" blocks. Delay blocks are usually needed to make LEDs flash, to debounce buttons or to wait for the next input. "Delay" times slow down the Arduino extremely, because in a "delay" loop nothing else is done than waiting.