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@jersey
paradigm being the number of gears needed, number of rings needed, etc... brakes, threadless headsets, the manner in which wheels are attached to bikes, the interface between the BB and cranks, chain guides, interchangeable dropouts, thru-axles. I was not talking abotu the fact that deraileurs are parallelograms.
anyway... yes they are all parallelograms, but a major shift is in the size of the deraileur and the size of the drive train. Much less chain is needed to get a range of gears nowadays, leading to smaller derailoerus. People rarely use three rings upfront also, and so the rear deraileurs can be even more compact. In fact, i alluded to this a few posts back. In the 90's no one could really understand why shimano thought MTB deraileurs had to be bigger, and so we ran 105 road deraileurs with road cassettes.
another major change has been in the the angle that the housing enters the derailleru. much less housing and bending is needed. Better shifting is noted, especially when going into smaller cogs.