You're comparing a 12" 2-in-1 with a 17" gaming-oriented desktop replacement. Configure the SP4 for its max specs, and the CPU is still lower-powered, it has half the memory, half the storage, and a tiny fraction of the graphics capability. And obviously, is about $1800 cheaper. Faster CPU, more RAM, another SSD, a larger, higher-res screen, and what has to be some amazing thermal management design. In those terms, the price doesn't seem so outlandish.
It's just very different hardware, optimized for very different things.
It's just very different hardware, optimized for very different things.