You wish! Intel only very recently (e.g. 3 years ago) brought 4 cores to mainstream in the mobile segment.
Low power mobile chips were dual core until Q3 2017 when Kaby Lake refresh was released and brought 4 cores to the i5 and i7 line-up. Even then, entry level and mainstream versions (i3 in particular) remained dual core configs.
I have a cheap Thinkpad E-series from 2012 with Intel i7-3612QM 4c/8t CPU. At the time it cost a third less than a Macbook. As far as price was concerned it was mainstream.