I'm not the best person to talk about the evolution of bonsai in the last 20 years (I've only been doing this for two years), but I think that this hobby has become easier to practice after the advent of new information technologies.
About thirty years ago, I became interested in this art and bought a book that I still have. No photographs, just drawn illustrations. Having only that support, without clubs or practitioners known to me, I didn't even take the effort to buy any plant.
But when they gave me a bonsai two years ago, it was enough for me to connect to the internet to develop all the necessary skills and knowledge. All tools and materials are accessible online...
So being able to take care of more than a hundred projects, enjoying (and not suffering) is all the result of the changes of the last 20 years...I definitely think that practicing bonsai is much easier now.....A separate factor would be the weather. I also believe that this may be a factor that makes cultivation more complicated than it was in the past.