No man, its the 6GB that makes that card. Who cares about 10-15% perf really, that's half a tier difference, an OC on Pascal usually gets you half that number already.
4GB cards are just obsolete for gaming in 2022, simple. And the only other 6GB alternative has shite perf/drivers/availability. Plus the vast majority of 4GB alternatives is heavily handicapped beyond VRAM too. The 1060 6GB is just a full blown mid range card, no ifs or buts.
Another aspect is, the product is tried and tested, and the architecture is on equal footing with AMD's latest in many ways.