I went and checked the 8th gen, and yeah, the vast majority is 4c/8t now, with a few 2c/4t and 6c/12t models in the mix.
By far, by miles, the most popular i7 of the 7th gen was the i7-7500U, which was used in just about every sub-$1000 laptop, and it's a dual core. Sure they had higher end...