Yes that's the point!
Even if you consider parts number than weight, or phisical size of the builded set, the result is the same.
From my point of view, the most important element is the fact that they are using more and more a series of "tricks" to mask and reduce the visual effect of the consistent reduction of sets: rich graphics used as background of the boxes, which "fill" and make sets look less skinny, use of small parts (although special parts, to improve the detail, as someone said above) to increase the count of the pieces, use of separable "sub-models" rather than a "single bloc"k to increase the overall dimensions... Things so.
Just compare the pictures of some 2015 sets (for example of the City serie, but not only of course) with similar a few years ago and all these things are evident...