Sound quality of Newer versus Older speakers


From a sound quality perspective, is there anything that newer speakers are doing better than older speakers. For reference, I have a pair of Monitor Audio Silver 300s which are amazing me with their ability to balance detail retrieval with an ability to avoid harshness (with the right ancillaries). My subjective perception is that this type of balance between resolution and refinement was more difficult to find in speakers from 20-30 years ago.
calvinandhobbes
@spacecadet65 Improvement of metal dome tweeters is one change that I've heard since the 90's. Back then, my impression was that many of them were harsh to the point of being unlistenable. Newer metal dome tweeter designs seem to have provide a level of precision while taming the harshness.
My old BIC VENTURI - v-830 and - v630 are still awesome!

    Some of the best speakers I bought. Still in use. Cerwin Vega D-9’s still in use. 
Materials get better, componentry gets better, boxes get better, drive units get better.
One of the major differences is the HF extension.

G
The one thing most are missing here is crossover parts quality. Mundorf and Dueland have turned the capacitor industry on their heads. Even Wilson is making their own caps now.

I changed out the Mundorf EVO caps on my Nola Viper 1AX's tweeters/mids to Mundorf Silver/Gold oil and the difference was NOT subtle and that's going from a very good midline cap to a top of the line caps. Resistors also fall in that line as well as inductors but caps are the most notable.