Are current audio cable designs superior to 1980s designs?


(I'm reposting this question under a new title because the original was vague, misleading, and elicited irrelevant replies).

Been using the same pair of 1980s AudioQuest rubber-encased XLR cables between pre and power amps since 1987 with good results -- good in the noncomparative abstract, that is. Components have come and gone, but the AQs have remained the sole constant. Until Morrow's recent Reopening Sale gave me an excuse to play with a more contemporary design. Just made the switch and I know the Morrow burn-in can be prolonged. Plan to set FM tuner overnights to "white noise" rather than BBC human voice signal to speed the process.

Question: to what degree do you believe balanced interconnect designs have improved over the past 30-40 years? And, price range being the same (adjusted for inflation), would you expect the current lean, lightweight Morrows to outperform the old, heavy-duty AudioQuest design? Morrow says they will, but what do this forum's many cable experts think about it?  
hickamore
I'm just kind of impressed that some audio manufacturer was putting XLR jacks on the back of their amps in 1987.  Preamp AND amplifier, who was this manufacturer?  

I really hope it wasn't a pro amp like Crown or Belringer.
Preamp was Bryston BP series; amp was B&K 4420, dual mono in single chassis.Regular consumer grade components.

@mahlman
..."Seriuosly now copper is copper ...

Respectfully disagree, particularly when comparing low grade grainy  copper to higher grade purity OFC or smooth OCC copper within interconnects and speaker cables. On a revealing audio system it exposes the difference in an interesting and unexpected way, fwiw.  

Sitting here are the exact same interconnect cable designs in OFC and OCC grades, and swapping them on any input source or between preamp to amplifier, the difference is audible and notable with moderate hearing capability. As to what someone prefers, YMMV.   
Coming back to the original question, yes I think you'll find that cables are better made now, there is more choice, and the prices are increasingly ludicrous as mentioned before. 
Nothing to prevent you from trying out and (if convinced) purchasing used -- I think you'll have fun and that's what it's all about, isn't it!
Do you have an audio dealer nearby? Ask if you could borrow several new broken in cables and find out for yourself.