I'm also not sure what the obsession with ego is. I mean if someone is a jerk, or a beginner, thats one thing.
No, you seem to misunderstand the very basic points I am trying to make.
Take a look at any art that supposably tried sparring to help thier skills. Given enough time, each and every one I can imagine ended up as no better than a sport. While people are
saying things like they are learning more from their losses than their wins, their
actions are to win even if it runs counter to good habits.
That is the ego that makes them do it. And they do not know that it is their ego leading them around. If you step back a few years and look back on something that happened to you, you may be able to shake your head and realize that it was your ego calling the shots. But
at the time you will come up with justifications for your actions and defend what you do to the death. We do not see the ego that controls us and we should avoid situations where we might be lured by it. Otherwise, what we do will probably end up like the guys doing XMA kata for trophies.
Let me tell you a story I have told here before. Years ago I served as a translator for a question to one of the shihan for a particular question. Someone had heard that Hatsumi used to do randori/sparring but had given it up and they wanted to know if it was true. The shihan confirmed that this was the case. But the guys that were allowed to do this were only those that had
perfect taijutsu and they were observed by Hatsumi during training. Hatsumi gave up this type of training when he found that several gaijin students had their taijutsu
degrade after sparring. They developed bad habits.
Maybe if our taijutsu is perfect, we can do it too. But we need to be very, very careful. To be honest, I do not think my taijutsu is perfect. But I think I know what type of standard I should be shooting for. And the number of people that are in the Bujinkan that do not even seem to be aware of that standard of perfection is the vast majority IMO. So for them to do sparring would be a mistake. If my teachers in Japan have me do randori, then I will do it under their watchful gaze. But for me to declare to the world that my taijutsu is perfect and I can do sparring on my own strikes me as a bit arrogent.