Cerebras I'd bet it's the plumbing. Getting data in and out, supplying something around 10-100 kiloamps, attaching it to anything without it ripping itself off

Cerebras I'd bet it's the plumbing. Getting data in and out, supplying something around 10-100 kiloamps, attaching it to anything without it ripping itself off via thermal expansion, getting the heat out - all of that sounds miserably difficult. Like sure you can do some outrageous and expensive things to make it all work in small quantities and for huge sums of money. But you can't build a mass-market laptop that way. I'd guess that the upper limit with present-day and near-future packaging technology for commodity hardware is ~1000 mm^2.