For me it started out with serious research in regard to martial arts. I was lucky enough to have had enough people around me that allowed me to train the techniques in an 'alive' manner as I was the one to introduce sparring in my original dojo some 7 years prior to my leaving.
We had focus mitt training and I even got people to do PT so there was no problems in that regard. My problems happened when I saw too many of my peers and senior dan ranks that decided to make Martial Arts more than it really was. It seemed like everyone was selling enlightenment on the side. My teacher went off the deep end and all but the young guys ditched my classes because of one excuse or another.
The change also happened in Japan.
When I first went to class in Japan, before the 15th dan bullshit and before anyone was a 10th in the US (I think). Those days, techniques and training was conducted with more attention to detail and more varied and realistic training scenarios. I had met guys that trained and actually fought Shooto here in Japan, and trained in the BJK.
This change in the last 5 years, there are a bunch of guys that walk around with large ranks that can't fight and have appeared to have little to no clue about actual training. I realized that I was serious, but the people that I was associated with were not. I had received stupid comments from some of the senior people that joked about my serious approach to learning martial arts.
I decided that the Bujinkan was not a place for someone who actually wanted to learn about fighting. Everyone says, "oh, the shihan have the skills", the "shihan are the fighters". They are part of the problem, even the Japanese have transitioned to LARPing about their own culture.
I find that I fit my current Judo dojo much more than I ever fit in anywhere else. The training is full contact, the training is hard, no excuses, everyday is a workout and everyone wants to be there.