No feedback after user's action causes frustration and insecurity, a sense of lack of control. It is because of our brain structure. We, work like that. This is how we learn.

60% of internet traffic comes from bots. Some of them are malicious but most are working for you...

As a UX designer, you should know and understand some basics. For example, what is the difference between wireframe, prototype, and mockup. To not confuse clients or associates.