The Little Albert experiment demonstrated classical conditioning. His experiment exemplifies how behavior can be learned and conditioned and is not just biological. Behaviour can be influenced by social and external factors. Watson had introduced Albert to different animals however made a loud noise every time a white rat was presented to Albert. The loud noise distressed Albert and resulted in a fear in response to the rat and other animals as well. I believe it is widely used in psychological textbooks until this day because it exemplifies the starting of phobias and the treatment development for them. Furthermore, this experiment also touches many concerns in regards to ethics. Which serves as an ethical guide for other experiments as well.
Great application! Yes ethics plays a big part,it is safe to say that such an experiment would most likely not pass the ethics board. Little Albert also gives us an insight into how human behavior is shaped and not just animal behavior.