Aside from the other replies I read, I'd say overall better
workmanship and more uniformity in measurements.

I think that is just a sign of modern builders being lazy or incompetant.


If by lazy, you mean being able to build a quality product for less
money, then yes. Modern trusses are mass produced. The material and
labor to install them is less, not more. And, yes, as someone else
said, the installation is more like to go smoothly even if some of the
workers are "incompetant" as you say.