The reason that rogue waves form has been settled science for at least the last 50 years.
This is not controversial; neither have rogue waves been considered “myths”, at least not be knowledgeable people during my lifetime. They are a perfectly natural occurrence at sea.
Consider that there are thousands of waves forming and dissapating in the oceans, of all different wavelengths, amplitude, and directionality. From time to time and place to place these waves will overtake, cross and interact with one another, as all sorts of propagating waves will do.
From time to time two or several waves strongly reinforce one another and form a towering “rogue” wave. It is and always has been a statistical certainty in the world ocean that this will occur.
Probably more like a soliton, like a tidal bore, rather than a random constructive wave interference phenomenon. A soliton can persist for a lot longer than a random interference node. Quite an interesting thing.