Also, it wouldn't matter if they were using PCI-E 4.0, its still an 8x electrical interface, NVIDIA are still using PCI-E 3.0 on the 20x0 series and AMD don't yet have anything in the same space on laptops.
You might want to look it up. They didn't have time when locking in the Renior design to add PCI-E 4.0, so it's a 3.0 interface and only 8x at that for the gpu
There's a reason why you can't really get anything above an rtx2060 though and that's the 8 lane pcie 3.0 interface. As such, until next year Intel is going to be the only place to get the best gaming experience in a laptop.
My 6 year old Defiance was bought with use for a long time in mind (quad core processor FHD with two msata slots as well as 2.5" Ssd). I have 2.5TB of SSD storage and 32GB of RAM in it these days. I do my Dev stuff on it in Linux.
Yeah the 860M isn't really great for gaming, neither is the 60Hz...