currently i use import/export for creating configurable products automatically. this is also quite a buch of work , because attributes aren't imported like in 1x.
The optional attributes section in the csv file is quite unhandy. i wonder if m2 developers have ever seen a productlist which a merchant from the manufaturer is normally receiving, especially the color and sizes of an article or adding a manufacturer attribute or fabric and whatever you can think about must get stuffed into one single csv field ?
furthermore if, for example the size, has a value which is not predefined in the attribute, import does not work - you can add everything manually, then.
we are selling clothes, having more than 50 brands and every manufacturer uses different sizing, different colornames each season. so we have to add about 20.000 simple products and have to create about 5000 configurable semi-automatically using the import every half year.
currently we have in our old m1-shop about 500 different colors (there are the colorcombinations not included), about 300 different size-descriptions and some other fields with different values. each season == twice a year, everything gets new, new colors, new fabrics, etc .. i wonder, how i should manage that for the future, maybe using a differnet shop-system ?