Not hope. I see them in videos with (apparently) untrained people. I see them from new students who don't have previous training. I see them in schools of other styles among the newest students. They are predictably common. They don't happen every time, by any stretch, but they are common among that population.
Bear in mind, I lump experienced people into the "trained" group, even if they don't have formal training. If they fight a lot, they'll either get rid of these tendencies, or they will lose a lot. Thus, street fighters with no training will be less likely to make these mistakes than someone who is trained.
And alcohol and anger make them more common. Fear of being hit brings out another set of predictable responses, and this will happen even among trained people if they haven't gotten used to getting hit.