Concerning changes between then and now, something that occurs to me is that those practicing a century ago were much less impacted, if impacted at all, by the telephone.
That may sound obvious, but the impact would be huge.
There are days that I hardly get off the phone. And as I try to take my phone calls, even if really busy, it means that the phone impacts the flow of my work a great deal. This would not have been the case at one time.
It's really difficult to imagine, actually. A day without phone calls and without email. Communications would come solely by mail or by direct contact. I suppose if people had a question, they dropped by to ask it or to make an appointment, and most contacts would have been very much local.