I read an article sometime ago talking about the draw, appeal, sound, ect that a lot of people have and like in vintage amps, processors, keyboards and so on. The article went on the mention that the sound today of a 60...or more year old piece of electronic equipment is most likely not how it actually sounded when it was new unless it has been maintained over the years.
"We" had acquired a preference for sounds to be distorted in certain ways and called it "rich, creamy, analogue goodness." The more component drift, the less compliant (or rotted) a loudspeaker suspension, friction, mechanical slippage... the more "we" loved it. Now we model the circuit response and create digital plugins of Our Preferred Distortions.
There are a couple dozen reasons that B3/122 packages from "real" backline providers come with a hefty price tag, and there are still enough players that know the difference to keep those instruments rented out.
Probably several good "inside the Hammond B3" videos on the intertubes and maybe folks will link a favorite, but the take way will be "wow, I didn't know....." Whole lot of points of failure in that box.