I think its worth noting that roshar is a bit of a special case. For thousands of years any technological advancement roshar made seemed to be wiped out with the desolations. Think about how much farther they would be as a society if that was never an issue. However, I think because of the Heralds and the nature of humans some of that advancement persisted through the desolations. Also its worth noting that they have had 7000 years since the recreance to make advancement. Compare that to our own timeline and they seem relatively behind the curve. I think its definitely plausible that they're ahead in some areas and behind in others.