The only thing I notice with older speakers (and it is not the sound) is many more have lower power ranges for the amplifier. For example, many current B&W bookshelf speakers are rated for amps ranging 30 to 150 watts. A lot of their 80s vintage bookshelf products ranged from 10 to 90 watts.
I use a pair of DM100i in my office powered by a 70s vintage Rotel receiver. They sound a lot better than a pair of DM601s I tried earlier. Not enough power to drive the 601s well. I think current higher powered Home Theater applications have forced speaker makers to change their approach to speaker design, sometimes to the detriment of music listeners.