https://frame.work/blog/framework-laptop-13-pro-deep-dive-lp...
I've been eyeing LPCAMM2 interposers for non-RAM uses - as an off the shelf connector for stacked PCB designs. The conclusion was that it wasn't produced or used at sufficient scale for it to work.
https://www.koreatimes.co.kr/business/tech-science/20260420/...