I sometimes notice that there are big contradictions in the martial arts. For instance, and I've discussed this before, how they will say that being a first degree black belt doesn't mean you're a master or even an expert it just means you're a serious beginner, but then they make it so hard to get that you practically have to be a master to get it. Sounds very contradictory to me.
OP, this is a great question.
I have trained in a handful of styles over the years since the 80s, and the one thing I noticed is the common need for humans to signal or show off a skill (sparring, beating the hell out of a dojo bag, etc.) Think of a silverback gorilla grunting or beating his chest. Before my brain came online when I was 25, I fell into signaling via katas (or sets) and bag work.
However, there is a steep learning curve (understatement of the year), when one needs to apply these skills outside the training space. The contradiction arrives when you have a picture of what you think you are, and then some event shows you that most of what you thought you knew was installed via vainglory. Keep in mind that this of course may not happen universally.
One style in particular (I won't utter the name in order not to shame) that I trained was taught by a teacher who often touted some mighty talk about our "special" techniques. He often sounded off (silverback?) about how Technique A would knock someone out.
The contradiction: Sparring tournaments or medium sparring in the old training space once again shows you where the unexpected weaknesses exist in your school's method. You travel from thinking your style is perfect to thinking: Huh, we have rough edges too. Another contraction: In my experience, tournament sparring seemed to result in kangaroo hopping and the standard (dare I say universal) modified boxing guard (even if you fronted an exotic animal style). However, I hate generalization, so I will say most competitors sparred in the manner I described.
Last, and this is something I blog about, professional fighters also experience a rough translation from the MMA ring to the "street." Note: For many, "street" is a meme (or like Richard Dawkins likes to say, an idea, habit, tune, belief). We all tend to grace our memes with random personal experiences, nod, and feel satisfied that we are in the know. However, I sadly note that fighters like Fau Vake and Kenzhayev paid a high price to realize the "street" (often) has nobody willing to stop an encounter. Usually, those who could intervene are too busying capturing "the fight" on their phone. Conclusion: Both fighters died in their encounter in the "street."