If you'll allow an outsider's perceptions (I don't train in any form of ninjutsu), I suspect that what you will find is that the training "then" versus the training "now" is that it was different. In some ways, it may have been harder physically, where perhaps today there's a different emphasis on understanding so that the physicality isn't needed as much. Today, you might be working harder mentally than you would have back then.
Using my own system as an example, when my teacher began training -- it was all about fighting. They didn't do anything that wasn't directly oriented to fighting. They trained incredibly hard, and they worked the basics over and over again. When I started training 20 years ago, we were still pretty hard. We had a few other things, but you had to put your time in if you wanted to see those. Today, we've got beginners learning stuff that I waited years to get, from some teachers. Our chief instructor (who introduced our system to the US) has, in my direct experience, shifted his emphasis many times. I've seen him emphasizing footwork for years moving to striking or grappling or stretching and healing. Today, he's moved into a non-violent martial arts approach which I envoy, but know I don't have the mindset for. But...was training better 20 years ago (or 30 or 50)? Or just different?
Using my own system as an example, when my teacher began training -- it was all about fighting. They didn't do anything that wasn't directly oriented to fighting. They trained incredibly hard, and they worked the basics over and over again. When I started training 20 years ago, we were still pretty hard. We had a few other things, but you had to put your time in if you wanted to see those. Today, we've got beginners learning stuff that I waited years to get, from some teachers. Our chief instructor (who introduced our system to the US) has, in my direct experience, shifted his emphasis many times. I've seen him emphasizing footwork for years moving to striking or grappling or stretching and healing. Today, he's moved into a non-violent martial arts approach which I envoy, but know I don't have the mindset for. But...was training better 20 years ago (or 30 or 50)? Or just different?