blink without delay would result in nothing, since it's looped thru in rapid speed.!?
No you do not understand it.
The blink without delay makes a note of the time now and when something needs to be done. Then the loop goes very fast seeing if it is time to do the task. If it is you do the task and set the time to do it again. It mattes not if the task is blinking an LED or stepping a motor.
If you do this with two tasks you have your two stepping motors running at the same time at speeds set interdependently.